Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Increase in deferred revenue	$ 13,987	$ 8,235	$ 7,162
Additional invoices	146,900	111,000
Revenue	132,949	102,707	$ 78,813
Increase in deferred revenue		8,300
Revenue recognized previously deferred	28,900	$ 20,900
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized	$ 64,400
Revenue expected to be recognized, percentage	85.00%
Revenue, remaining performance obligation, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized, percentage	13.00%
Revenue, remaining performance obligation, period	12 months