Warrants - Additional Information (Details)			1 Months Ended	12 Months Ended
	May 11, 2015 USD ($) $ / shares shares	Jan. 15, 2015 USD ($) $ / shares shares	Aug. 31, 2014 Institution	Dec. 31, 2016 USD ($) Institution $ / shares	Dec. 31, 2015 USD ($)	Mar. 31, 2016 $ / shares shares	Aug. 22, 2014 $ / shares shares
Class Of Warrant Or Right [Line Items]
Proceeds from exercise of warrants | $					$ 8,948
Loss on change in fair value of the preferred stock and convertible note warrants | $				$ 0	239,683
Fair value of the preferred stock warrant liability | $				$ 0	$ 0
Growth Term Loan
Class Of Warrant Or Right [Line Items]
Number of loan lending institutions | Institution			2	2
Series E Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrants issued to acquire shares	23,396					5,317	2,512,562
Warrants exercise price | $ / shares	$ 23.51			$ 23.51		$ 23.51	$ 0.2189
Warrant Expiration Date				Aug. 22, 2024
Series C-1 Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Preferred stock warrants forfeited and cancelled	1,290,350
Series C-2 Redeemable Convertible Preferred Stock | IPO
Class Of Warrant Or Right [Line Items]
Warrants issued to acquire shares	1,488
Warrants exercise price | $ / shares	$ 24.23
Series D Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Conversion of stock, shares issued	6,729
Proceeds from exercise of warrants | $	$ 1,752
Common Stock Warrants one
Class Of Warrant Or Right [Line Items]
Warrants issued to acquire shares						45,307
Warrants exercise price | $ / shares				$ 2.76		$ 2.759
Convertible Note Warrants
Class Of Warrant Or Right [Line Items]
Warrants issued to acquire shares		9,311,586
Warrants exercise price | $ / shares		$ 0.2189		$ 14.00
Warrant Expiration Date				Jan. 15, 2022
Aggregate consideration | $		$ 1,354
Convertible Note Warrants | IPO
Class Of Warrant Or Right [Line Items]
Warrants issued to acquire shares	144,772
Warrants exercise price | $ / shares	$ 14.00