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Income Taxes - Reconciliation for Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	$ (5,154)	$ 4,402	$ (3,470)
State income taxes, net of federal benefit	10	32	24
Foreign income and withholding taxes	79	89	(22)
Expenses from resolution of certain tax audits and expiration of statute of limitations	64	(32)	(16)
Stock-based compensation	(6,386)	113	258
Section 162(m)	621	0	0
Expired attributes	3,118	1,964	846
Change in valuation allowance	6,986	(5,857)	(3)
Research and development credits	(43)	(261)	(72)
Global Intangible Low-Taxed Income	0	6	176
Adoption of accounting principles	0	0	2,464
Other	420	(159)	170
Provision for (benefit from) income taxes	$ (285)	$ 297	$ 355

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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