Redeemable Convertible Preferred Stock and Stockholders' Deficit - Summary of Common Stock Reserved for Future Issuance (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Common stock reserved
Reserved shares of common stock for future issuance	1,784,920	3,496,394
Dividends on common stock	$ 0.00
Redeemable Convertible Preferred Stock Warrants
Common stock reserved
Reserved shares of common stock for future issuance		27,690
Common Stock Warrants
Common stock reserved
Reserved shares of common stock for future issuance	27,690
Options Issued and Outstanding
Common stock reserved
Reserved shares of common stock for future issuance	1,414,730	927,175
Shares Available for Future Option Grants
Common stock reserved
Reserved shares of common stock for future issuance	342,500	55,330
Redeemable Convertible Preferred Stock
Common stock reserved
Reserved shares of common stock for future issuance		2,486,199