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Warrants (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 27, 2014 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2010 | Mar. 31, 2015
Number of shares after conversion of issued warrants (in shares) |  | 24,566 |  |  | 34,839 |
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 1.67 |
Converted shares (in shares) | 24,566 |  |  |  |  |
Exercise price (in dollars per share) | $ 12.21 |  |  |  |  |
Exercise period |  |  |  |  | 6 years |
Warrant liability |  |  | $ 0 |  |  |
Roll-forward of fair value of warrants |  |  |  |  |  |
Preferred Stock warrants converted (in shares) | 24,566 |  |  |  |  |
Number of warrants (in shares) |  | 24,566 |  |  | 34,839 |
Level 3 |  |  |  |  |  |
Roll-forward of fair value of warrants |  |  |  |  |  |
Balance at beginning of period |  | $ 108,000 | 108,000 |  |  |
Issuance of warrants at fair value |  |  | 107,000 |  |  |
Change in fair value, recorded as a component of other expense |  |  | (9,000) |  |  |
Balance at end of period |  |  |  | $ 108,000 |  |
Reclassification to additional paid-in capital |  |  | $ (206,000) |  |  |
Warrant Liability |  |  |  |  |  |
Fair Value Assumptions |  |  |  |  |  |
Risk-free interest rate (as a percent) |  | 1.97% |  | 1.95% |  |
Expected dividend yield (as a percent) |  | 0.00% |  | 0.00% |  |
Expected term |  | 6 years 6 months |  | 6 years 8 months 12 days |  |
Expected volatility (as a percent) |  | 75.79% |  | 78.16% |  |
2014 Warrants |  |  |  |  |  |
Number of shares after conversion of issued warrants (in shares) | 315,688 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ 0.9503 |  |  |  |  |
Exercise period |  |  | 7 years |  |  |
Roll-forward of fair value of warrants |  |  |  |  |  |
Balance at end of period |  |  | $ 100,000 |  |  |
Number of warrants (in shares) | 315,688 |  |  |  |  |
2015 Warrants |  |  |  |  |  |
Number of shares after conversion of issued warrants (in shares) |  |  |  |  |  | 315,688
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 0.9503
Roll-forward of fair value of warrants |  |  |  |  |  |
Balance at end of period |  |  | $ 100,000 |  |  |
Number of warrants (in shares) |  |  |  |  |  | 315,688

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