Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating expenses:
Research and development	$ 13,750	$ 7,685
General and administrative	4,998	5,481
Total operating expenses	18,748	13,166
Loss from operations	(18,748)	(13,166)
Interest income	358	670
Other income	5	0
Loss before income tax provision (benefit)	(18,385)	(12,496)
Income tax provision (benefit)	(3,309)	5
Net loss	(15,076)	(12,501)
Comprehensive loss	$ (15,076)	$ (12,501)
Net loss per common share:
Net loss per common shares - basic and diluted (in dollars per share)	$ (0.28)	$ (0.30)
Weighted average common shares outstanding:
Weighted average common shares outstanding - basic and dilutive (in shares)	53,426	41,427