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Long-term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended
May 29, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 15, 2016
May 10, 2016
Mar. 31, 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      
Loss on debt extinguishment     $ (260,000) $ 0 $ (260,000)      
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        
Original loan amount $ 17,700,000              
Basis variable rate 7.95%              
Maturity date       Jun. 01, 2019        
Fees amount associated with loan $ 1,100,000              
Date from which warrants are exercisable       Nov. 30, 2015        
Number of shares callable by warrants (in shares) 94,441              
Warrant exercise price (in dollars per share) $ 10.35              
Warrant expiration date       May 29, 2025        
Repayment of long term debt $ 25,400,000              
Term Loan remaining balance at date of Amendment 23,400,000              
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%              
Term Loan [Member] | Final Payment [Member]                
Debt Instrument [Line Items]                
Fees amount associated with loan $ 800,000              
Minimum | Term Loan [Member]                
Debt Instrument [Line Items]                
Interest rate 8.95%