License Agreements and Acquired Product Rights (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 60,356	$ 36,703
Shiongi License And Supply Agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	30,636
Shiongi License And Supply Agreement | Symproic License
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	30,000
Shiongi License And Supply Agreement | Transaction Expense
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 636