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Preferred Stock Warrant Liabilities - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 02, 2017 | Oct. 26, 2016 | Jun. 30, 2014 | Nov. 30, 2012 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 27, 2013
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Change in fair value of preferred stock warrant liabilities |  |  |  |  |  |  | $ 996,000 |
Series D Preferred Stock |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase shares |  |  | 20,136 |  |  |  |  |
Exercise price of warrants |  |  | $ 7.31 |  |  |  |  |
Change in fair value of preferred stock warrant liabilities |  |  |  |  | $ 15,000 |  | (41,000) |
Warrants expiry period |  |  |  |  |  | 2024-06 |  |
Warrant exercised | 10,068 | 10,068 |  |  |  |  |  |
Warrant exercise period | May 02, 2017 | Oct. 26, 2016 |  |  |  |  |  |
Issuance of common stock upon exercise of warrants, Shares | 8,077 | 7,310 |  |  |  |  |  |
Series D Preferred Stock | Warrant |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Fair value assumptions, discount rate |  |  | 30.00% |  |  |  |  |
Fair value warrants recorded as debt discount |  |  | $ 100,000 |  |  |  |  |
2012 Loan Agreement | Series D Preferred Stock |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase shares |  |  |  |  |  |  |  | 207,177
Change in fair value of preferred stock warrant liabilities |  |  |  |  | $ 500,000 |  | $ 700,000 |
Warrant outstanding |  |  |  |  |  | 127,918 |  |
2012 Loan Agreement | Series C Preferred Stock |  |  |  |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  | $ 0.001 |  |  |  |
Warrants term |  |  |  | 7 years |  |  |  |

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