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 6 Months Ended
Jun. 30, 2020
USD ($)
Customer
Jun. 30, 2019
Customer
Jun. 30, 2020
USD ($)
Customer
Jun. 30, 2019
Customer
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Deferred revenue $ 979   $ 979   $ 1,217
Deferred revenue recognized     $ 954    
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 3 3 3 3  
Percentage of benchmark 64.00% 82.00% 60.00% 76.00%  
Non-US | Geographic Concentration Risk | Sales          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of benchmark 32.00% 12.00% 23.00% 27.00%