Consolidated Statements of Operations and Comprehensive 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
Revenues
Revenues	$ 16,566	$ 7,881	$ 34,210	$ 8,765
Types of Revenue[Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating Expenses
Cost of revenues	$ 4,684	$ 1,927	$ 8,093	$ 1,956
Research and development	38,111	29,483	75,146	54,686
General and administrative	15,554	13,405	30,387	24,963
Other operating expenses (income)	50	(62)	117	(62)
Total operating expenses	58,399	44,753	113,743	81,543
Loss from operations	(41,833)	(36,872)	(79,533)	(72,778)
Other Income
Interest income from licensing	1,849	762	2,697	1,375
Investment income	5,722	34,524	2,536	37,519
Total other income	7,571	35,286	5,233	38,894
Loss before income taxes	(34,262)	(1,586)	(74,300)	(33,884)
Income Tax Benefit	500	129	500	199
Net loss	(33,762)	(1,457)	(73,800)	(33,685)
Other Comprehensive Income
Unrealized gain on available-for-sale securities, net	1,330	530	545	1,151
Total other comprehensive income	1,330	530	545	1,151
Comprehensive loss	$ (32,432)	$ (927)	$ (73,255)	$ (32,534)
Basic and diluted net loss per share	$ (0.91)	$ (0.04)	$ (1.98)	$ (0.92)
Weighted-average basic and diluted common shares outstanding	37,257	36,669	37,180	36,518