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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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