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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 132,719	$ 141,496	$ 153,612	$ 172,640	$ 182,245	$ 72,116	$ 153,612	$ 72,116
Other comprehensive income (loss)	520	76	(303)	(135)	54	10	293	(71)
Ending Balance	151,973	132,719	141,496	162,605	172,640	182,245	151,973	162,605
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(812)	(921)	(618)				(618)
Other comprehensive income (loss)	523	109	(303)
Ending Balance	(289)	(812)	(921)				(289)
Unrealized Gain (Loss) on Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	3	36	36				36
Other comprehensive income (loss)	(3)	(33)	0
Ending Balance	0	3	36				0
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(809)	(885)	(582)	(623)	(677)	(687)	(582)	(687)
Other comprehensive income (loss)	520	76	(303)	(135)	54	10
Ending Balance	$ (289)	$ (809)	$ (885)	$ (758)	$ (623)	$ (677)	$ (289)	$ (758)

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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 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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