Quarterly report pursuant to Section 13 or 15(d)

Revenue - Additional Information (Details)

v3.20.2
Revenue - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
Customer
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
Customer
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred revenue $ 798   $ 798   $ 1,217
Deferred revenue recognized     $ 1,200    
Customer Concentration Risk | Sales          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of customers that accounted for approximately 10% or more of revenue | Customer 4 4 4 4  
Percentage of benchmark 66.00% 83.00% 63.00% 79.00%  
Non-US | Geographic Concentration Risk | Sales          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of benchmark 58.00% 22.00% 35.00% 24.00%