License Agreements and Acquired Product Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 04, 2019
Finite-Lived Intangible Assets [Line Items]
Selling, general and administrative		$ 98,827	$ 86,063	$ 58,602
Symproic license and distribution rights | Shiongi License And Supply Agreement
Finite-Lived Intangible Assets [Line Items]
Upfront first installment payment					$ 20,000
Upfront installment hence to be made					$ 10,000
Selling, general and administrative			$ 400
Symproic license and distribution rights | Shiongi License And Supply Agreement | Additional Royalty As A Percentage
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	1.00%
Symproic license and distribution rights | Shiongi License And Supply Agreement | Royalty Agreement Terms | Minimum
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	8.50%
Symproic license and distribution rights | Shiongi License And Supply Agreement | Royalty Agreement Terms | Maximum
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	17.50%