Revenue by Product - Summary of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments (in segments) | segment	1
Segment Reporting Information [Line Items]
Total revenues	$ 12,243	$ 16,437
Bloxiverz
Segment Reporting Information [Line Items]
Total revenues	1,401	2,568
Vazculep
Segment Reporting Information [Line Items]
Total revenues	5,514	9,473
Akovaz
Segment Reporting Information [Line Items]
Total revenues	5,349	3,792
Other
Segment Reporting Information [Line Items]
Total revenues	$ (21)	$ 604