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Warrants (Details) - Warrant [Member] - Level 3 [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value Assumptions [Abstract]      
Number of shares underlying the warrants (in shares) 403,090   403,090
Stock price (in dollars per share) $ 2.43   $ 2.20
Volatility 47.30%   47.00%
Risk-free interest rate 1.38%   1.22%
Expected dividend yield 0.00%   0.00%
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period $ 105 $ 7,042 $ 7,042
Increase (decrease) in fair value 4 (5,184)  
Reclassification to Equity   (1,541)  
Balance as end of period $ 109 317 $ 105
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]      
Number of warrants to purchase common stock (in shares) 403,090    
Minimum [Member]      
Fair Value Assumptions [Abstract]      
Expected warrant life 1 year 7 months 13 days   2 years 1 month 13 days
Maximum [Member]      
Fair Value Assumptions [Abstract]      
Expected warrant life 1 year 10 months 6 days   2 years 4 months 6 days
10/31/2013 [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period $ 39 379 $ 379
Increase (decrease) in fair value 2 (267)  
Reclassification to Equity   0  
Balance as end of period $ 41 112 39
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]      
Number of warrants to purchase common stock (in shares) 137,143    
2/5/2014 [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period $ 66 715 715
Increase (decrease) in fair value 2 (510)  
Reclassification to Equity   0  
Balance as end of period $ 68 205 66
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]      
Number of warrants to purchase common stock (in shares) 265,947    
7/24/2014 Series A [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period   2,415 2,415
Increase (decrease) in fair value   (1,573)  
Reclassification to Equity   (842)  
Balance as end of period   0  
7/24/2014 Series B [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period   1,726 1,726
Increase (decrease) in fair value   (1,713)  
Reclassification to Equity   (13)  
Balance as end of period   0  
6/22/2015 [Member]      
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]      
Balance as beginning of period   1,807 $ 1,807
Increase (decrease) in fair value   (1,121)  
Reclassification to Equity   (686)  
Balance as end of period   $ 0