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Stockholders' Equity - AOCI Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in the balances of each component of AOCI
Balance at the beginning of the period	$ 374,512	$ 437,775	$ 840,093
Other comprehensive income (loss)	(48)	74	8
Balance at the end of the period	408,374	374,512	437,775
Accumulated Other Comprehensive Income
Changes in the balances of each component of AOCI
Balance at the beginning of the period	1,894	1,820	1,812
Other comprehensive income (loss)	(48)	74	8
Balance at the end of the period	1,846	1,894	1,820
Foreign Currency Translation
Changes in the balances of each component of AOCI
Balance at the beginning of the period	1,861	1,836	1,839
Other comprehensive income (loss)	5	25	(3)
Balance at the end of the period	1,866	1,861	1,836
Unrealized Gains (Losses) on Available for Sale Securities
Changes in the balances of each component of AOCI
Balance at the beginning of the period	33	(16)	(27)
Other comprehensive income (loss)	(53)	49	11
Balance at the end of the period	$ (20)	$ 33	$ (16)

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- Definition

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

+ References

No definition available.

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- Definition

Amount after tax of other comprehensive income (loss) 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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