Income Taxes - Reconciliation of the U.S. federal statutory income tax (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Income tax provision (benefit) at the U.S. federal statutory rate	$ (111)	$ 2,540	$ (7,828)
State income taxes	(519)	323	(543)
Permanent differences	292	(53)	521
Change in valuation allowance	(18,572)	(3,720)	6,258
Effect of foreign operations	(825)	325	373
Stock-based compensation	(838)	198	478
Transaction costs	1,262
Derivative liability	(6,612)
Effect of change in tax rates	(835)	(253)	(320)
Sale of foreign subsidiary		1,323
Research & development tax credits	(501)	(253)	(922)
Foreign currency translation & transactions	254	144	33
Prior period adjustments		230	1,210
Other	601	137	382
Total provision (benefit) for income taxes	$ (26,404)	$ 941	$ (358)

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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