Quarterly report pursuant to Section 13 or 15(d)

Revenue and Cost of Revenues - Narrative (Details)

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Revenue and Cost of Revenues - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Increase in contract with customer liability $ 7,882,000    
Recognized deferred revenue 16,900,000 $ 15,500,000  
Deferred sales incentive compensation 10,400,000   $ 10,800,000
Amortization expense for the deferred sales incentive compensation 1,100,000 1,000,000.0  
Impairment loss for capitalized costs $ 0 $ 0