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Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 162,266	$ (29,199)	$ 2,780
Net other comprehensive (loss) income	(80,218)	8,783	(32,616)
Ending balance	78,244	162,266	(29,199)
Unrealized gain (loss) on marketable securities, tax	214	(202)	(43)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(22,627)	(23,738)	(23,621)
Net other comprehensive (loss) income	(1,228)	1,111	(117)
Ending balance	(23,855)	(22,627)	(23,738)
Unrealized gain (loss) on marketable securities, net
Accumulated Other Comprehensive Income (Loss)
Beginning balance	1,576	932	205
Net other comprehensive (loss) income	(1,661)	644	727
Ending balance	(85)	1,576	932
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(21,051)	(22,806)	(23,416)
Ending balance	$ (23,940)	$ (21,051)	$ (22,806)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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