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Warrants (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 22, 2016 $ / shares shares | Jul. 21, 2014 shares | Dec. 31, 2016 USD ($) shares $ / shares | Dec. 31, 2015 USD ($) $ / shares shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |
Fair value of warrants adjustment (income) expense |  |  | $ (5,396) | $ (1,814)
7/24/2014 Series A [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  | 6,198,832 |  |
Warrant [Member] |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |
Fair value of warrants adjustment (income) expense |  |  |  | $ (1,814)
Fair Value Assumptions [Abstract] |  |  |  |
Number of shares underlying warrants (in shares) | shares | 12,083,821 |  | 2,015,446 | 14,099,267
Stock price (in dollars per share) | $ / shares | $ 0.65 |  | $ 0.44 | $ 1.11
Volatility |  |  | 47.00% |
Risk-free interest rate |  |  | 1.22% |
Expected dividend yield | 0.00% |  | 0.00% | 0.00%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 14,099,267 |
Reductions | shares |  |  | (12,083,821) |
Number of warrants to purchase common stock (in shares) | shares |  |  | 2,015,446 | 14,099,267
Warrant [Member] | Minimum [Member] |  |  |  |
Fair Value Assumptions [Abstract] |  |  |  |
Volatility | 35.00% |  |  | 35.90%
Risk-free interest rate | 0.25% |  |  | 0.02%
Expected warrant life | 1 month 2 days |  | 2 years 1 month 13 days | 25 days
Warrant [Member] | Maximum [Member] |  |  |  |
Fair Value Assumptions [Abstract] |  |  |  |
Volatility | 50.00% |  |  | 50.00%
Risk-free interest rate | 1.04% |  |  | 1.63%
Expected warrant life | 4 years |  | 2 years 4 months 6 days | 4 years 5 months 23 days
Warrant [Member] | 10/31/2013 [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 685,715 |
Reductions | shares |  |  | 0 |
Number of warrants to purchase common stock (in shares) | shares |  |  | 685,715 | 685,715
Warrant [Member] | 2/5/2014 [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 1,329,731 |
Reductions | shares |  |  | 0 |
Number of warrants to purchase common stock (in shares) | shares |  |  | 1,329,731 | 1,329,731
Warrant [Member] | 7/24/2014 Series A [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 4,288,500 |
Reductions | shares |  |  | (4,288,500) |
Number of warrants to purchase common stock (in shares) | shares |  |  | 0 | 4,288,500
Warrant [Member] | 7/24/2014 Series B [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 4,795,321 |
Reductions | shares |  |  | (4,795,321) |
Number of warrants to purchase common stock (in shares) | shares |  |  | 0 | 4,795,321
Warrant [Member] | 6/22/2015 [Member] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] |  |  |  |
Number of warrants to purchase common stock (in shares) | shares |  |  | 3,000,000 |
Reductions | shares |  |  | (3,000,000) |
Number of warrants to purchase common stock (in shares) | shares |  |  | 0 | 3,000,000
Warrant [Member] | Level 3 [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | $ 7,042 | $ 499
Initial measurements |  |  |  | 2,958
Reclassed from equity |  |  | (1,541) | 5,399
Increase (decrease) in fair value |  |  | (5,396) | (1,814)
Balance as end of period |  |  | 105 | 7,042
Warrant [Member] | Level 3 [Member] | 10/31/2013 [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | 379 | 233
Initial measurements |  |  |  | 0
Reclassed from equity |  |  | 0 | 0
Increase (decrease) in fair value |  |  | (340) | 146
Balance as end of period |  |  | 39 | 379
Warrant [Member] | Level 3 [Member] | 2/5/2014 [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | 715 | 266
Initial measurements |  |  |  | 0
Reclassed from equity |  |  | 0 | 0
Increase (decrease) in fair value |  |  | (649) | 449
Balance as end of period |  |  | 66 | 715
Warrant [Member] | Level 3 [Member] | 7/24/2014 Series A [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | 2,415 | 0
Initial measurements |  |  |  | 0
Reclassed from equity |  |  | (842) | 3,452
Increase (decrease) in fair value |  |  | (1,573) | (1,037)
Balance as end of period |  |  | 0 | 2,415
Warrant [Member] | Level 3 [Member] | 7/24/2014 Series B [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | 1,726 | 0
Initial measurements |  |  |  | 0
Reclassed from equity |  |  | (13) | 1,947
Increase (decrease) in fair value |  |  | (1,713) | (221)
Balance as end of period |  |  | 0 | 1,726
Warrant [Member] | Level 3 [Member] | 6/22/2015 [Member] |  |  |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract] |  |  |  |
Balance as beginning of period |  |  | 1,807 | 0
Initial measurements |  |  |  | 2,958
Reclassed from equity |  |  | (686) | 0
Increase (decrease) in fair value |  |  | (1,121) | (1,151)
Balance as end of period |  |  | $ 0 | $ 1,807

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