Significant Accounting Policies - Contract Balances (Details) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) category	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)
Significant Accounting Policies
Accounts receivable, net	$ 96,867			$ 96,867		$ 101,616	$ 184,102
Deferred revenues	14,881			14,881		17,585	17,518
Customer deposits	16,319			16,319		16,955	17,707
Costs to obtain and fulfill a contract	1,485			1,485		1,674	$ 2,328
Unbilled receivables, net	29,700			29,700		25,700
Revenue recognized from deferred revenue	1,600	$ 1,800	$ 15,300	16,400		16,500
Amortization of contract costs	$ 200	$ 200		$ 600	$ 800	$ 1,100
Practical expedient on incremental costs of obtaining contracts				true
Number of principal categories | category				2