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Common Stock (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Common Stock, Authorized (in shares) | 150,000,000 | 132,000,000
Par value of common stock (in dollars per share) | $ 0.001 | $ 0.001
Common Stock, Issued, (in shares) | 15,313,297 | 493,200
Common Stock, Outstanding (in shares) | 15,313,297 | 493,200
Common Stock, Dividends, Per Share, Declared | $ 0 |
Shares reserved for future issuance (in shares) | 2,799,213 | 9,445,451
Series A Convertible Preferred Stock |  |
Shares reserved for future issuance (in shares) |  | 5,356,996
Series B Convertible Preferred Stock |  |
Shares reserved for future issuance (in shares) |  | 2,655,992
Warrants for the purchase of Preferred Stock |  |
Shares reserved for future issuance (in shares) |  | 12,283
Warrants for the purchase of Common Stock |  |
Shares reserved for future issuance (in shares) | 59,405 | 34,839
Options to purchase Common Stock |  |
Shares reserved for future issuance (in shares) | 2,557,456 | 1,385,341
Employee Stock Purchase Plan |  |
Shares reserved for future issuance (in shares) | 182,352 |

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