Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Share-Based Compensation - Performance Contingent Awards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016
Share-Based Compensation
Share-based compensation expense	$ 16,585	$ 11,298	$ 31,861	$ 23,519
Research and development
Share-Based Compensation
Share-based compensation expense	8,098	5,720	15,963	11,880
Selling, general and administrative
Share-Based Compensation
Share-based compensation expense	$ 8,487	$ 5,578	$ 15,898	$ 11,639
Performance-Contingent Awards - RSAs
Share-Based Compensation
Shares approved for grant (in shares)					1,575,000
Vesting period					5 years
Awards outstanding (in shares)	414,000	877,500	414,000	877,500
Performance-Contingent Awards - RSUs
Share-Based Compensation
Awards outstanding (in shares)	54,000	101,250	54,000	101,250
Share-based compensation expense			$ 700
Performance-Contingent Awards - RSUs \| Senior management
Share-Based Compensation
Shares approved for grant (in shares)					135,000
Performance-Contingent Awards - RSUs
Share-Based Compensation
Awards outstanding (in shares)	120,000		120,000
Share-based compensation expense	$ 500
Maximum potential expense \| Performance-Contingent Awards - RSUs
Share-Based Compensation
Share-based compensation expense			$ 1,800
Second tranche
Share-Based Compensation
Share-based compensation expense		$ (300)	400	$ 500
Third tranche
Share-Based Compensation
Share-based compensation expense	$ 600		1,300
Third tranche \| Maximum potential expense
Share-Based Compensation
Share-based compensation expense			1,700
Third tranche \| Maximum potential expense \| Research and development
Share-Based Compensation
Share-based compensation expense			600
Third tranche \| Maximum potential expense \| Selling, general and administrative
Share-Based Compensation
Share-based compensation expense			$ 1,100