Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Revenues	$ 884	$ 132,391
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember
Costs of revenues
Costs of revenues	$ 29	$ 2,408
Type of Cost, Good or Service [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember
Research and development	$ 25,203	$ 19,550
General and administrative	11,558	8,380
Other operating expenses		28
Total operating expenses	36,790	30,366
Income (loss) from operations	(35,906)	102,025
Other Income
Interest income from licensing	613	1,355
Investment income	2,995	859
Total other income	3,608	2,214
Income (loss) before income taxes	(32,298)	104,239
Income Tax Benefit	70
Net income (loss)	(32,228)	104,239
Other Comprehensive Income (Loss)
Unrealized gain (loss) on available-for-sale securities, net of reclassifications and income tax expense	621	(188)
Total other comprehensive income (loss)	621	(188)
Comprehensive income (loss)	(31,607)	104,051
Net income (loss) applicable to common stockholders	$ (32,228)	$ 104,239
Net income (loss) per share:
Basic	$ (0.89)	$ 3.30
Diluted	$ (0.89)	$ 3.04
Weighted-average common shares outstanding:
Basic	36,366	31,632
Diluted	36,366	34,275