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Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allocated share-based compensation expense $ 27 $ 686 $ 394 $ 2,443
Cost of Sales        
Allocated share-based compensation expense   43   133
Research and Development        
Allocated share-based compensation expense 11 119 120 440
Clinical and Regulatory        
Allocated share-based compensation expense 12 19 39 84
Selling and Marketing        
Allocated share-based compensation expense   118 41 379
General and Administrative        
Allocated share-based compensation expense $ 4 $ 387 $ 194 $ 1,407