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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Cash and Cash Equivalents      
Restricted cash $ 847 $ 847 $ 847
Equity Method Investment      
Impairment charges 0 0  
Cost of Goods and Services Sold $ 16,070 $ 16,039  
Cost, Product and Service [Extensible List] us-gaap:LicenseAndServiceMember us-gaap:LicenseAndServiceMember  
Promon      
Equity Method Investment      
Ownership percentage 17.00%    
Cost of Goods and Services Sold $ 1,200 $ 600  
Amount owed included in accounts payable and accrued liabilities $ 3,200    
Letter of Credit      
Cash and Cash Equivalents      
Restricted Cash, Asset, Statement of Financial Position [Extensible List] Other Assets, Noncurrent   Other Assets, Noncurrent
Restricted cash $ 800