CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Operations And Comprehensive Loss
Revenue	$ 684		$ 684
Cost of revenue	453		453
Gross profit	231		231
Operating expenses:
Research and development	10,864	$ 7,162	26,601	$ 26,533
General and administrative	8,123	3,650	20,611	10,407
Total operating expenses	18,987	10,812	47,212	36,940
Loss from operations	(18,756)	(10,812)	(46,981)	(36,940)
Other income, net	564	118	1,392	336
Net loss	$ (18,192)	$ (10,694)	$ (45,589)	$ (36,604)
Net loss per share, basic and diluted (in dollars per share)	$ (0.63)	$ (0.50)	$ (1.68)	$ (1.76)
Weighted average common shares outstanding, basic and diluted (in shares)	28,834,808	21,415,871	27,180,244	20,752,590
Other comprehensive loss:
Unrealized gain (loss) on marketable securities, net of tax of $0	$ 63	$ (12)	$ 7	$ 144
Foreign currency translation adjustments	(10)	(43)	149	(49)
Total other comprehensive income (loss)	53	(55)	156	95
Comprehensive loss	$ (18,139)	$ (10,749)	$ (45,433)	$ (36,509)