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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Cash and Cash Equivalents          
Restricted cash $ 847 $ 847 $ 847 $ 847 $ 847
Equity Method Investment          
Impairment charges     0 0  
Cost of Goods and Services Sold $ 15,478 $ 26,669 $ 49,773 60,588  
Cost, Product and Service [Extensible List] us-gaap:LicenseAndServiceMember us-gaap:LicenseAndServiceMember      
Promon          
Equity Method Investment          
Ownership percentage 17.00%   17.00%    
Cost of Goods and Services Sold $ 200 $ 1,200 $ 1,600 $ 2,400  
Amount owed included in accounts payable and accrued liabilities $ 1,500   $ 1,500    
Letter of Credit          
Cash and Cash Equivalents          
Restricted Cash, Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent   Other Assets, Noncurrent   Other Assets, Noncurrent
Restricted cash $ 800   $ 800