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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (2,609)	$ (736)	$ (2,372)	$ (1,938)
Unrealized gain on available-for-sale securities, net of deferred taxes	0	23	0	8
Comprehensive loss	$ (2,609)	$ (713)	$ (2,372)	$ (1,930)

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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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