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Details of Selected Balance Sheet Accounts - Accounts Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | $ 199,036 | $ 190,551
Allowance for doubtful accounts | (4,779) | (4,471)
Accounts receivable, net | $ 194,257 | $ 186,080
Allowance for doubtful accounts as a percentage of total accounts receivable | 2.00% | 2.00%
Trade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | $ 124,692 | $ 116,434
Unbilled revenue |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | 24,368 | 24,389
Contract assets |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | 39,937 | 39,755
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | $ 10,039 | $ 9,973

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