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Term Loan Obligations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 19, 2018
Dec. 29, 2017
May 29, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 24, 2018
May 23, 2018
Sep. 20, 2017
Debt Instrument [Line Items]                    
Number of shares callable by warrants (in shares)               2,300,000 23,400,000  
Minimum liquidity covenant       $ 1,500,000   $ 1,500,000        
Interest expense       444,000 $ 538,000 866,000 $ 1,129,000      
Non-cash amortization       100,000 $ 200,000 $ 200,000 $ 400,000      
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              
Number of shares callable by warrants (in shares)     9,444              
Warrant exercise price (in dollars per share)     $ 103.50              
Date from which warrants are exercisable           Nov. 30, 2015        
Warrant expiration date           May 29, 2025        
Minimum liquidity covenant     $ 5,000,000             $ 1,500,000
Extended interest-only period Dec. 01, 2018         Aug. 01, 2018        
Debt instrument, interest-only period The Second Amendment extends the interest-only period under the Term Loan to December 1, 2018 if the Company receives unrestricted gross cash proceeds of at least $15 million from the sale and issuance of the Company’s equity securities on or before August 31, 2018.         The amendment also extended the interest-only period under the Loan Agreement through August 1, 2018, as the Company successfully closed on a financing and received unrestricted net cash proceeds in excess of $5 million on or before December 29, 2017.        
Net proceeds excess receives from unrestricted cash   $ 5,000,000                
Amendment fee $ 300,000                  
Debt instrument, covenant compliance           we were in compliance with all of the debt covenants under the Loan and Security Agreement.        
Minimum [Member] | Term Loan [Member]                    
Debt Instrument [Line Items]                    
Interest rate     8.95%              
Unrestricted gross cash proceeds required to extend interest-only period $ 15,000,000                  
Maximum [Member] | Term Loan [Member]                    
Debt Instrument [Line Items]                    
Original Loan Amount       $ 3,000,000   $ 3,000,000