Acquisition - Summary of Allocation of Preliminary Purchase Consideration (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 07, 2021	Jun. 17, 2021
Liabilities assumed
Goodwill	$ 837,910	$ 838,867
Total purchase consideration/Total assets acquired and liabilities assumed				$ 117,927
Redflex Holdings Limited
Assets acquired
Cash and cash equivalents				8,760
Restricted cash				2,163
Accounts receivable				6,870
Unbilled receivables				5,283
Property and equipment				29,809
Deferred tax assets				10,315
Other assets				19,247
Total assets acquired				127,447
Liabilities assumed
Accounts payable and accrued liabilities				31,936
Deferred revenue				8,048
Long-term debt				14,014
Other long-term liabilities				11,736
Total liabilities assumed				65,734
Goodwill				56,214
T2 Systems Acquisition
Assets acquired
Cash and cash equivalents			$ 13,866
Restricted cash			228
Accounts receivable			9,673
Unbilled receivables			2,153
Inventory			7,467
Property and equipment			3,336
Prepaid and other assets			7,477
Total assets acquired			231,000
Liabilities assumed
Accounts payable and accrued liabilities			10,379
Deferred revenue			21,253
Deferred tax liability			37,129
Other liabilities			4,228
Total liabilities assumed			72,989
Goodwill			195,226
Total purchase consideration/Total assets acquired and liabilities assumed			353,237
Trademarks | Redflex Holdings Limited
Assets acquired
Intangible assets				900
Trademarks | T2 Systems Acquisition
Assets acquired
Intangible assets			3,200
Customer Relationships | Redflex Holdings Limited
Assets acquired
Intangible assets				25,900
Customer Relationships | T2 Systems Acquisition
Assets acquired
Intangible assets			164,300
Developed Technology | Redflex Holdings Limited
Assets acquired
Intangible assets				$ 18,200
Developed Technology | T2 Systems Acquisition
Assets acquired
Intangible assets			$ 19,300