CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Common Stock Private Placement	Common Stock IPO	Common Stock	Additional Paid-In Capital Private Placement	Additional Paid-In Capital IPO	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Private Placement	IPO	Total
Balance at Dec. 31, 2016						$ 260,671	$ (269)	$ (90,912)			$ 169,490
Balance (in shares) at Dec. 31, 2016			26,059,181								26,059,181
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in connection with acquisition						9,675					$ 9,675
Issuance of common stock in connection with acquisition, shares			349,527
Issuance of common stock				$ 19,311	$ 80,918				$ 19,311	$ 80,918
Number of shares issued	635,000	3,747,602
Exercise of stock options and vesting of RSUs						168					168
Exercise of stock options and vesting of RSUs, shares			43,369
Unrealized loss on marketable securities							7				7
Foreign currency translation adjustment							149				149
Stock-based compensation expense						10,130					10,130
Net loss								(45,589)			(45,589)
Balance at Sep. 30, 2017						$ 380,873	$ (113)	$ (136,501)			$ 244,259
Balance (in shares) at Sep. 30, 2017			30,834,679								30,834,679