CONDENSED CONSOLIDATED STATEMENTS OF INCOME (OPERATIONS) AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development	$ 4,562	$ 7,944	$ 13,429	$ 12,630
General and administrative	3,318	2,617	6,766	5,672
Change in fair value of contingent consideration	18,480	44,000	(35,220)	43,000
Total operating expenses	26,360	54,561	(15,025)	61,302
Income (Loss) from Operations	(26,360)	(54,561)	15,025	(61,302)
Other income (expense):
Other income, net	16	226	195	487
Net Income (Loss) and Comprehensive Income (Loss)	$ (26,344)	$ (54,335)	$ 15,220	$ (60,815)
Net income (loss) per common share - basic (in dollars per share)	$ (0.24)	$ (0.67)	$ 0.13	$ (0.77)
Weighted-average common shares outstanding - basic (in shares)	112,569	80,739	111,189	79,107
Net income (loss) per common share - diluted (in dollars per share)	$ (0.24)	$ (0.67)	$ 0.11	$ (0.77)
Weighted-average common shares outstanding - diluted (in shares)	112,569	80,739	111,203	79,107