Quarterly report pursuant to Section 13 or 15(d) 03-31-2016

Organization and Summary of Significant Accounting Policies (Details Narrative)

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Organization and Summary of Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Net loss $ 3,388 $ 5,381    
Net cash used in operating activities 1,465 2,971    
Accumulated deficit $ 199,925   $ 196,537  
Debt instrument, payment terms As discussed further in Note 7, the Company has 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 $7.0 million at March 31, 2016.      
Cash and cash equivalents $ 7,943 $ 14,882 11,485 $ 18,247
Debt principal amount 15,981   17,814  
Hercules Term Loan [Member]        
Debt principal amount 15,218   $ 17,051  
Hercules Term Loan [Member] | Minimum [Member]        
Cash and cash equivalents 7,000      
Riverside Merchant Partners, LLC [Member]        
Debt principal amount 3,000      
Subordinated convertible promissory notes $ 3,000