CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue	$ 0	$ 0	$ 425
Operating expenses:
Research and development	24,663	14,077	12,510
General and administrative	12,208	11,623	8,070
Change in fair value of contingent consideration	71,620	8,800	9,100
Total operating expenses	108,491	34,500	29,680
Loss from Operations	(108,491)	(34,500)	(29,255)
Other income (expense):
Other income, net	991	807	226
Net Loss and Comprehensive Loss	$ (107,500)	$ (33,693)	$ (29,029)
Net loss per common share - basic and diluted (in dollars per share)	$ (1.18)	$ (0.55)	$ (1.11)
Weighted-average common shares outstanding - basic and diluted (in shares)	90,929	61,774	26,105
License revenue
Revenue:
Total revenue	$ 0	$ 0	$ 425