Debt - Additional Information (Details)
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3 Months Ended |
9 Months Ended |
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Sep. 08, 2015
USD ($)
$ / shares
shares
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Sep. 30, 2015
USD ($)
$ / shares
shares
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Sep. 30, 2014
USD ($)
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Sep. 30, 2015
USD ($)
installment
$ / shares
shares
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Sep. 30, 2014
USD ($)
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Jun. 30, 2015
USD ($)
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Dec. 31, 2014
USD ($)
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Aug. 11, 2014
USD ($)
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Jun. 30, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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| Debt Instrument [Line Items] |
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| Original principal amount |
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$ 20,990,000
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$ 20,990,000
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$ 24,500,000
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| Cash and cash equivalents |
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11,268,000
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$ 10,360,000
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11,268,000
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$ 10,360,000
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18,247,000
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$ 2,279,000
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| Proceeds from issuance of common stock, net of issuance costs |
$ 5,000,000
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| Loss on extinguishment of debt |
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(2,403,000)
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$ 0
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(2,324,000)
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1,596,000
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| Repayments of long-term debt |
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1,158,000
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$ 18,000,000
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| Hercules Term Loan |
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| Debt Instrument [Line Items] |
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| Original principal amount |
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18,841,000
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$ 18,841,000
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20,000,000
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$ 20,000,000
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| Debt and line of credit maturity date |
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Jan. 01, 2018
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| Term loan fee amount |
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200,000
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| Final payment fee for debt |
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$ 1,700,000
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$ 1,700,000
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1,500,000
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| Debt description |
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The Hercules Term Loan also includes a non-refundable final payment fee of $1.7 million. The final payment fee is being accrued and recorded to interest expense over the life of the loan.
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| Debt instrument, fixed rate |
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10.95%
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10.95%
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| Debt instrument, interest rate description |
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The Hercules Term Loan bears interest at the rate of the greater of either (i) the prime rate plus 7.7%, and (ii) 10.95%.
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| Debt instrument, periodic payment, principal |
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$ 700,000
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| Term loan, payment terms |
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Interest accrues from the closing date of the loan and interest payments are due monthly. Principal payments are required commencing August 1, 2015 and are to be made in 30 equal installments of approximately $700,000, with the remainder due at maturity.
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| Debt instrument, covenant description |
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Additionally, the Amendment reduced the Company’s obligation to maintain cash and cash equivalents of not less than $9.0 million to an amount that varies based on the loan amount. The minimum cash requirement is reduced by $500,000 for every $1.0 million paid in principal to a minimum of $2.5 million. The minimum cash and cash equivalents balance required to maintain compliance with the minimum liquidity covenant at September 30, 2015 was $8.5 million.
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| Debt instrument, covenant compliance |
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Although the Company was in compliance with the liquidity covenant at September 30, 2015, the Company anticipates that it will be non-compliant with the liquidity covenant during the fourth quarter of 2015 if additional financing is not obtained, and has therefore classified the entire obligation as a current liability.
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| Hercules Term Loan | Maximum |
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| Debt Instrument [Line Items] |
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| Number of installments for principal payments | installment |
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30
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| Hercules Term Loan | Prime rate plus |
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| Debt Instrument [Line Items] |
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| Debt instrument, variable interest rate |
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7.70%
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| Hercules Term Loan, The Amendment |
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| Debt Instrument [Line Items] |
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| Final payment fee for debt |
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$ 1,700,000
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$ 1,700,000
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| Interest rate increase (decrease) |
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1.50%
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| Percentage of prepayment amount |
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1.50%
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| Percentage of prepayment amount thereafter |
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0.75%
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| Hercules Term Loan, Liquidity Covenant |
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| Debt Instrument [Line Items] |
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| Cash and cash equivalents |
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8,500,000
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$ 8,500,000
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$ 9,000,000
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| Debt instrument, periodic payment, principal |
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1,000,000
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| Cash requirement reduction |
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500,000
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500,000
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| Cash requirement minimum |
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2,500,000.0
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2,500,000.0
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| Conversion Feature of Note |
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| Debt Instrument [Line Items] |
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| Original principal amount |
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2,900,000
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| Debt instrument purchase price |
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$ 2,500,000
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| Repayments of debt |
800,000
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| Magna August Note |
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| Debt Instrument [Line Items] |
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| Original principal amount |
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$ 2,149,000
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$ 2,149,000
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$ 3,500,000
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| Debt instrument purchase price |
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$ 3,500,000
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| Repayments of debt |
1,400,000
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| Amount agreed to be paid to redeem additional convertible debt if certain equity proceeds threshold is met |
1,250,000
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| Repayments of additional convertible debt |
1,100,000
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| Magna Convertible Notes |
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| Debt Instrument [Line Items] |
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| Original principal amount |
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$ 4,500,000
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| Loss on extinguishment of debt |
(2,400,000)
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| Convertible debt fair value |
3,500,000
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| Convertible Debt [Member] | Magna August Note |
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| Debt Instrument [Line Items] |
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| Debt instrument, fixed rate |
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6.00%
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6.00%
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| Convertible Debt [Member] | Magna Exchange Convertible Notes |
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| Debt Instrument [Line Items] |
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| Debt conversion original debt amount |
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$ 202,000
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| Number of shares converted | shares |
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373,000
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| Loss on extinguishment of debt |
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$ 79,000
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| Convertible Debt [Member] | Magna Exchange Convertible Notes, Mature on August 11, 2016 |
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| Debt Instrument [Line Items] |
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| Debt and line of credit maturity date |
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Aug. 11, 2016
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| September 2015 Offering |
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| Debt Instrument [Line Items] |
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| Proceeds from warrant exercises |
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$ 5,000,000
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| Outstanding warrants exercisable | shares |
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13,123,360
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13,123,360
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| Exercise price of warrants (in usd per share) | $ / shares |
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$ 0.47
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$ 0.47
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| Proceeds from offering |
$ 2,500,000
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| Proceeds from issuance of common stock, net of issuance costs |
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$ 131,000
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| September 2015 Offering |
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| Debt Instrument [Line Items] |
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| Proceeds from warrant exercises |
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$ 10,000,000
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| Hercules Warrant [Member] |
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| Debt Instrument [Line Items] |
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| Outstanding warrants exercisable | shares |
1,548,387
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| Exercise price of warrants (in usd per share) | $ / shares |
$ 0.47
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| Warrants and Rights Outstanding |
$ 382,000
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| Magna Warrant [Member] |
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| Debt Instrument [Line Items] |
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| Common stock, authorized, shares | shares |
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568,889
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568,889
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| Exercise price of warrants (in usd per share) | $ / shares |
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$ 4.65
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$ 4.65
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