Discontinued Operations - Assets and Liabilities of the Disposal Group (Details) - Tripwire - Discontinued Operations, Held-for-sale $ in Thousands	Dec. 31, 2021 USD ($)
Assets:
Cash and cash equivalents	$ 2,194
Receivables, net	28,773
Inventories, net	150
Other current assets	7,418
Property, plant and equipment, less accumulated depreciation	6,250
Operating lease right-of-use assets	3,893
Goodwill	331,024
Intangible assets, less accumulated amortization	63,541
Deferred income taxes	834
Other long-lived assets	5,325
Total assets of Tripwire disposal group	449,402
Liabilities:
Accounts payable	6,458
Accrued liabilities	56,208
Deferred income taxes	10,964
Long-term operating lease liabilities	5,257
Other long-term liabilities	20,192
Total liabilities of Tripwire disposal group	$ 99,079