Revenue from Contracts with Customers Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 89,346	$ 85,776	$ 85,705	$ 86,510	$ 86,271	$ 88,900	$ 85,573	$ 82,630	$ 347,337	$ 343,374	$ 331,378
U.S.
Disaggregation of Revenue [Line Items]
Total revenues									303,989	288,580	290,002
U.S. | Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues									303,989	288,580
International
Disaggregation of Revenue [Line Items]
Total revenues									43,348	54,794	$ 41,376
International | Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues									41,287	52,556
International | License and royalty revenues
Disaggregation of Revenue [Line Items]
Total revenues									$ 2,061	$ 2,238