Revenue by Product - Summary of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments (in segments) | segment			1
Segment Reporting Information [Line Items]
Total revenues	$ 10,091	$ 17,554	$ 22,334	$ 33,991
Bloxiverz
Segment Reporting Information [Line Items]
Total revenues	800	2,358	2,201	4,926
Vazculep
Segment Reporting Information [Line Items]
Total revenues	4,915	9,410	10,429	18,883
Akovaz
Segment Reporting Information [Line Items]
Total revenues	4,196	5,946	9,545	9,738
Other
Segment Reporting Information [Line Items]
Total revenues	$ 180	$ (160)	$ 159	$ 444