Organization and Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Nov. 10, 2017 |
Jan. 25, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Jul. 28, 2017 |
Dec. 31, 2014 |
|
| Net loss | $ 2,069 | $ 5,187 | $ 4,284 | $ 13,639 | $ 14,763 | $ 23,912 | ||||
| Net cash used in operating activities | 4,396 | 5,257 | 7,170 | 9,063 | ||||||
| Accumulated deficit | 215,323 | $ 215,323 | $ 211,300 | 196,537 | ||||||
| Debt instrument, payment terms | As discussed further in Note 7, in June 2014 the Company entered into a term loan with Hercules Technology Growth Capital, Inc. (Hercules Technology), as administrative and collateral agent for the lenders thereunder and as lender, and Hercules Technology III, LP, (HT III and, together with Hercules Technology, Hercules) as lender (the Hercules Term Loan). The Hercules Term Loan has a liquidity covenant that requires the Company to maintain a cash balance of the lesser of $2.5 million or the outstanding balance of the Hercules Term Loan. As of September 30, 2017, the outstanding balance on the Hercules Term Loan was $2.3 million and the Companys cash balance was $2.8 million. The Company believes it will be in position to maintain compliance with the liquidity covenant related to the Hercules Term Loan at least through November 2017. On July 28, 2017, the Company entered into a $2.5 million term loan with a related party that will assist the Company in its cash needs through November 2017. | As discussed further in Note 7, in June 2014, the Company entered into a term loan with Hercules Technology Growth Capital, Inc. (Hercules Technology), as administrative and collateral agent for the lenders thereunder and as lender, and Hercules Technology III, LP, (HT III and, together with Hercules Technology, Hercules) as lender (the Hercules Term Loan). The Hercules Term Loan has a liquidity covenant that requires the Company to maintain a cash balance of not less than $3.0 million at December 31, 2016. | ||||||||
| Term loan principal balance | $ 2,500 | |||||||||
| Cash and cash equivalents | 2,816 | $ 10,613 | $ 2,816 | $ 10,613 | $ 6,915 | $ 11,485 | $ 18,247 | |||
| Reverse stock split | 1 for 12 reverse stock split | 1 for 15 reverse stock split | ||||||||
| November 10, 2017 [Member] | ||||||||||
| Reverse stock split | 1 for 12 reverse stock | |||||||||
| Hercules Term Loan [Member] | ||||||||||
| Term loan principal balance | 2,300 | $ 2,300 | ||||||||
| Hercules Term Loan [Member] | Maximum [Member] | ||||||||||
| Term loan principal balance | $ 2,500 | $ 2,500 | ||||||||