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Net Loss Per Share Attributable to Common Stockholders - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 993,738	$ 1,029,090	$ 1,013,953	$ 1,061,865
Foreign currency translation adjustment	(22)	(186)	(192)	(228)
Unrealized loss on available-for-sale securities	(114)	27	(9,859)	(198)
Ending balance	966,979	1,015,579	966,979	1,015,579
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,542)	(261)	(2,627)	6
Ending balance	(12,678)	(420)	(12,678)	(420)
Unrealized Loss on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(11,987)	(120)	(2,242)	105
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on available-for-sale securities	(114)	27	(9,859)	(198)
Ending balance	(12,101)	(93)	(12,101)	(93)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(555)	(141)	(385)	(99)
Foreign currency translation adjustment	(22)	(186)	(192)	(228)
Unrealized loss on available-for-sale securities	0	0	0	0
Ending balance	$ (577)	$ (327)	$ (577)	$ (327)

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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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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