Significant Accounting Policies - Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Depreciation and Amortization [Line Items]
Depreciation and amortization	$ 6,567	$ 6,513	$ 6,336
Cost of revenue
Schedule of Depreciation and Amortization [Line Items]
Depreciation and amortization	4,534	4,211	3,942
Sales and marketing
Schedule of Depreciation and Amortization [Line Items]
Depreciation and amortization	432	624	775
Research and development
Schedule of Depreciation and Amortization [Line Items]
Depreciation and amortization	168	257	353
General and administrative
Schedule of Depreciation and Amortization [Line Items]
Depreciation and amortization	$ 1,433	$ 1,421	$ 1,266