Summary of Significant Accounting Policies - Schedule of Product Sales (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
Product Information [Line Items]
Total revenue	$ 48,258	$ 41,147	$ 56,702	$ 49,785	$ 56,053	$ 51,337	$ 59,296	$ 46,626	$ 195,892	$ 213,312	$ 236,707
Bendeka
Product Information [Line Items]
Total revenue									31,182	24,568	16,225
Belrapzo
Product Information [Line Items]
Total revenue									29,665	22,853	0
Ryanodex
Product Information [Line Items]
Total revenue									13,039	20,195	17,500
Other
Product Information [Line Items]
Total revenue									103	2,769	11,602
Product sales
Product Information [Line Items]
Total revenue									$ 73,989	$ 70,385	$ 45,327