Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Narrative)

v3.5.0.2
Organization and Summary of Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Net loss $ 5,064 $ 5,933 $ 8,452 $ 11,314    
Net cash used in operating activities     2,379 5,323    
Accumulated deficit 204,989   $ 204,989   $ 196,537  
Debt instrument, payment terms     As discussed further in Note 7, 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 $4.5 million at June 30, 2016.      
Cash and cash equivalents 5,155 $ 12,394 $ 5,155 $ 12,394 11,485 $ 18,247
Debt principal amount 12,091   12,091   17,814  
Hercules Term Loan [Member]            
Debt principal amount 10,628   10,628   $ 17,051  
Hercules Term Loan [Member] | Minimum [Member]            
Cash and cash equivalents 4,500   4,500      
Riverside Merchant Partners, LLC [Member]            
Debt principal amount 3,000   3,000      
Subordinated convertible promissory notes 3,000   3,000      
Converitble promissory notes in aggregate principal amount $ 3,000   $ 3,000