CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CONSOLIDATED STATEMENT OF COMPREHENSIVE LOSS
Revenue	$ 5,030	$ 3,106
Operating expenses:
Research and development	16,902	10,739
General and administrative	5,822	4,070
Total operating expenses	22,724	14,809
Loss from operations	(17,694)	(11,703)
Other income (expense), net	624	948
Net loss	$ (17,070)	$ (10,755)
Net loss per share, basic and diluted (in dollars per share)	$ (0.58)	$ (0.42)
Weighted average common shares outstanding, basic and diluted (in shares)	29,527,349	25,592,659
Comprehensive loss:
Net loss	$ (17,070)	$ (10,755)
Other comprehensive income
Unrealized gain on marketable securities	197	24
Total other comprehensive income	197	24
Comprehensive loss	$ (16,873)	$ (10,731)