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Long-term Obligations (Details) - USD ($)
 12 Months Ended
May 29, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 15, 2016
May 11, 2016
May 10, 2016
Debt Instrument [Line Items]            
Number of shares callable by warrants (in shares)       1 1,100,000 16,000,000
Warrant exercise price (in dollars per share)       $ 3.06    
Repayment of long term debt   $ 0 $ 25,032,000      
Unamortized debt discount   1,152,000        
Loss on debt extinguishment   0 (260,000)      
Minimum liquidity covenant   5,000,000        
Future contractual principal and final fee payments on all debt and capital lease obligations [Abstract]            
2017   7,080,000        
2018   7,080,000        
2019   4,629,000        
Contractual principal and final fee payments, Total   18,789,000        
Reconciliation of Face Value to Book Value [Abstract]            
Total debt and lease obligations, including final payment fee (Face Value)   18,789,000        
Less: Debt discount   (1,152,000)        
Total obligation   17,637,000        
Interest expense   2,592,000 3,379,000      
Non-cash amortization   $ 1,000,000 $ 1,000,000      
LIBOR [Member] | Interest Rate Floor [Member]            
Debt Instrument [Line Items]            
Basis variable rate 1.00%          
Term Loan [Member]            
Debt Instrument [Line Items]            
Origination Date   May 29, 2015 May 29, 2015      
Original Loan Amount $ 17,700,000 $ 17,700,000 $ 17,700,000      
Basis variable rate 7.95%          
Maturity date   Jun. 01, 2019        
Fees amount associated with loan $ 1,100,000          
Number of shares callable by warrants (in shares) 94,441          
Warrant exercise price (in dollars per share) $ 10.35          
Date from which warrants are exercisable   Nov. 30, 2015        
Warrant expiration date   May 29, 2025        
Repayment of long term debt $ 25,400,000          
Remaining Principal (Face Value) 23,400,000 $ 17,700,000 17,700,000      
Accrued but unpaid interest 200,000          
Final payment fee 1,800,000          
Principal amount of previous loan retired 3,100,000          
Unamortized debt discount $ 800,000          
Loss on debt extinguishment     $ 300,000      
Effective interest rate 14.95%          
Minimum liquidity covenant $ 5,000,000          
Debt instrument, covenant compliance   we were in compliance with the debt covenants        
Additional details relating term loan that is outstanding [Abstract]            
Origination Date   May 29, 2015 May 29, 2015      
Original Loan Amount 17,700,000 $ 17,700,000 $ 17,700,000      
Interest Rate [1]   8.95% 8.95%      
Current Monthly Payment [2]   $ 136,000 $ 136,000 [1]      
Original Term   48 months 48 months      
Remaining Principal (Face Value) 23,400,000 $ 17,700,000 $ 17,700,000      
Reconciliation of Face Value to Book Value [Abstract]            
Less: Debt discount (800,000)          
Term Loan [Member] | Final Payment [Member]            
Debt Instrument [Line Items]            
Fees amount associated with loan $ 800,000          
Minimum [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Interest rate 8.95%          
[1] 3 month LIBOR rate with a floor of 1% plus 7.95%
[2] Monthly payment as of December 2016, which reflects interest only