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Subsequent Events - Major Classes of Assets and Liabilities (Details) - Discontinued Operations, Held-for-sale - Tripwire - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 2,194 | $ 1,328
Receivables, net | 28,773 | 26,001
Inventories, net | 150 | 126
Other current assets | 7,418 | 9,798
Property, plant and equipment, less accumulated depreciation | 6,250 | 7,588
Operating lease right-of-use assets | 3,893 | 5,151
Goodwill | 331,024 | 462,202
Intangible assets, less accumulated amortization | 63,541 | 67,979
Deferred income taxes | 834 | 800
Other long-lived assets | 5,325 | 2,653
Total assets of Tripwire disposal group | 449,402 | 583,626
Liabilities: |  |
Accounts payable | 6,458 | 4,868
Accrued liabilities | 56,208 | 61,769
Deferred income taxes | 10,964 | 12,599
Long-term operating lease liabilities | 5,257 | 7,019
Other long-term liabilities | 20,192 | 17,214
Total liabilities of Tripwire disposal group | $ 99,079 | $ 103,469

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