Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 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	67,437	$ 48,768	190,315	$ 126,944
U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net product sales	20,278	15,411	58,857	36,660
Ex-U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net product sales	$ 47,159	$ 33,357	$ 131,458	$ 90,284