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Prepaid Commission Expense - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Amortization Of Deferred Charges [Abstract]        
Amortization period of deferred commissions     7 years  
Amortization expense $ 200 $ 40 $ 400 $ 100