Annual report pursuant to Section 13 and 15(d)

Revenue (Deferred Sales Incentive Compensation) (Details)

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Revenue (Deferred Sales Incentive Compensation) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Deferred sales incentive compensation   $ 9,387 $ 7,014
Amortization expense for the deferred sales incentive compensation   $ 3,452 $ 2,132
Impairment loss for capitalized costs $ 0