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Debt - Notes Payable (Details) - USD ($)
12 Months Ended
Jul. 23, 2015
Oct. 17, 2014
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Number of securities called by warrants (shares)   480,392 8,837,351  
Interest expense     $ 800,000 $ 100,000
July 2025        
Debt Instrument [Line Items]        
Number of securities called by warrants (shares) 152,440   152,440  
Warrant exercise price (USD per share) $ 1.64   $ 1.64  
Warrant expiration period 10 years      
Fair value of warrants recorded as a discount to the principal balance $ 100,000      
Loan And Security Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 10,000,000.0    
Debt instrument final payment fee, percentage   6.00%    
Loan And Security Agreement | Common Stock        
Debt Instrument [Line Items]        
Number of securities called by warrants (shares)   193,798    
Warrant exercise price (USD per share)   $ 1.29    
Loan And Security Agreement | Term Loan 1        
Debt Instrument [Line Items]        
Proceeds from credit facility   $ 5,000,000    
Interest rate   7.95%    
Debt instrument, prepayment fee, percentage   3.00%    
Fair value of warrants recorded as a discount to the principal balance     $ 201,000 $ 237,000
Loan And Security Agreement | Term Loan 2        
Debt Instrument [Line Items]        
Proceeds from credit facility $ 5,000,000      
Interest rate 8.01%