Annual report pursuant to Section 13 and 15(d)

Revenues and Cost of Revenues (Deferred Sales Incentive Compensation) (Details)

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Revenues and Cost of Revenues (Deferred Sales Incentive Compensation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Deferred sales incentive compensation $ 10,814,000 $ 9,387,000
Amortization expense for the deferred sales incentive compensation 3,936,000 3,452,000
Impairment loss for capitalized costs $ 0 $ 0