Company Operations by Product - Summary of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Total product sales	$ 33,161	$ 51,757
License revenue	132	750
Total revenues	$ 33,293	52,507
Number of operating segments (in segments) | segment	1
Bloxiverz
Segment Reporting Information [Line Items]
Total product sales	$ 7,491	13,902
Vazculep
Segment Reporting Information [Line Items]
Total product sales	12,961	10,179
Akovaz
Segment Reporting Information [Line Items]
Total product sales	10,217	25,638
Noctiva
Segment Reporting Information [Line Items]
Total product sales	666	0
Other
Segment Reporting Information [Line Items]
Total product sales	$ 1,826	$ 2,038