v3.4.0.3
Debt - 2014 Loan and Security Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 28, 2014
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total debt, net carrying value   $ 35,519,000 $ 37,039,000
Debt, gross   36,473,000  
Term Loan | 2014 Loan and Security Agreement      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 30,000,000.0    
Credit facility, remaining borrowing capacity 10,000,000.0    
Credit facility, minimum incremental borrowing amount 1,000,000.0    
Total debt, net carrying value   $ 19,300,000 $ 20,000,000
Term Loan | 2014 Loan and Security Agreement | Prime Rate      
Debt Instrument [Line Items]      
Term loan, minimum interest rate   10.00%  
Term Loan | 2014 Loan and Security Agreement | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, basis spread   9.00%  
Term Loan | Tranche One      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity 20,000,000.0    
Payments of debt issuance costs 400,000    
Debt, gross $ 20,000,000.0    
Common Stock | Term Loan | 2014 Loan and Security Agreement      
Debt Instrument [Line Items]      
Warrants issued 177,865    
Warrants outstanding, exercise price (in USD per share) $ 10.12    
Common Stock | Term Loan | Tranche One      
Debt Instrument [Line Items]      
Warrants vested, shares 118,577    
Common Stock Warrant | Term Loan | 2014 Loan and Security Agreement      
Debt Instrument [Line Items]      
Class of warrant or right, vesting period (in years) 10 years    
Warrants unvested, shares 59,288