Business Combinations - Fair Values of Assets Acquired and Liabilities Assumed for Acquisitions (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 04, 2021	Dec. 31, 2020
Liabilities assumed:
Goodwill	$ 80,873		$ 57,541
Holobuilder
Tangible assets acquired:
Accounts receivable		$ 192
Property, plant and equipment, net		46
Other assets		7
Total assets acquired		245
Liabilities assumed:
Accounts payable and accrued liabilities		(56)
Deferred revenue		(2,732)
Total liabilities assumed		(2,788)
Intangible assets		10,470
Net deferred tax asset		987
Net assets acquired		8,914
Goodwill		24,994
Purchase price paid, net of cash acquired		$ 33,908