Goodwill and Intangible Assets - Change in Carrying Value of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2022	$ 407,551
Foreign currency translation adjustments	7,214
Balance as of June 30, 2023	414,765
Clear Aligner
Goodwill [Roll Forward]
Balance as of December 31, 2022	109,480
Foreign currency translation adjustments	959
Balance as of June 30, 2023	110,439
Systems and Services
Goodwill [Roll Forward]
Balance as of December 31, 2022	298,071
Foreign currency translation adjustments	6,255
Balance as of June 30, 2023	$ 304,326