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Warrants (Tables) | 12 Months Ended
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Dec. 31, 2015
Warrants. |
Roll-forward of the fair value of warrants determined by Level 3 inputs | The following table provides a roll-forward of the fair value of the 2014 Warrants and 2015 Warrants determined by Level 3 inputs (in thousands):
|  | Fair Value |
Balance at December 31, 2014 |  | $ | 108 |
Issuance of warrants at fair value |  |  | 107 |
Change in fair value, recorded as a component of the other (expense) income, net |  |  | (9 | )
Reclassification to additional paid-in capital |  |  | (206 | )
​ | ​ | ​ | ​ | ​
Balance at December 31, 2015 |  | $ | — |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Schedule of weighted-average assumptions |
|  | June 30, 2015(1) |  | December 31, 2014 |
Risk-free interest rate |  |  | 1.97 | % |  | 1.95 | %
Expected dividend yield |  |  | 0.00 | % |  | 0.00 | %
Expected term (in years) |  |  | 6.5 |  |  | 6.7 |
Expected volatility |  |  | 75.79 | % |  | 78.16 | %
(1) | Represents the date the warrants for series B convertible preferred stock converted to warrants for common stock

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- Definition Tabular disclosure of the activity related to warrants during the period. Including but not limited to beginning and ending balance, increase/decrease in the fair value of warrants. + References No definition available. + Details
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- Definition Tabular disclosure of the weighted average assumptions used to determine the fair value of warrants. Estimations were based on the Black-Scholes option pricing model. + References No definition available. + Details
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