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Company Operations by Product, Customer and Geographic Area - Revenue by Significant Customer (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues $ 103,269 $ 173,245 $ 150,246
Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 101,423 172,841 147,222
Customer A | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 26,794 44,762 51,648
Customer B | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 25,413 37,965 39,359
Customer C | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 18,620 25,691 30,916
Customer D | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 9,653 53,342 17,728
Others | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues 20,943 11,081 7,571
License revenue      
Segment Reporting Information [Line Items]      
Total revenues 1,846 404 3,024
License revenue | Wholesaler Customer      
Segment Reporting Information [Line Items]      
Total revenues $ 1,846 $ 404 $ 3,024