Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Allowance for doubtful accounts receivable	$ 100		$ 100
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net product sales	62,353	$ 44,130	122,878	$ 78,176
U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net product sales	20,807	12,181	38,579	21,249
Ex-U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net product sales	$ 41,546	$ 31,949	$ 84,299	$ 56,927