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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 36,640,000	$ 50,041,000	$ 61,506,000	$ 81,752,000	$ 85,114,000	$ 80,747,000	$ 61,506,000	$ 80,747,000
Other comprehensive income (loss) before reclassifications	(5,000)	(27,000)	(51,000)	(138,000)	352,000	10,000
Net losses (gains) reclassified from accumulated other comprehensive loss	(1,000)				3,000
Other comprehensive (loss) income	(6,000)	(27,000)	(51,000)	(138,000)	355,000	10,000	(84,000)	227,000
Ending balance	13,983,000	36,640,000	50,041,000	73,428,000	81,752,000	85,114,000	13,983,000	73,428,000
Gross realized gains, available for sale securities	0			23,000			0
Gross realized losses, available for sale securities	0						0	6,000
Proceeds from sale of debt securities, available-for-sale				9,404,000			4,000,000
Unrealized gains (losses) on short-term investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	5,000	32,000	83,000	338,000	(17,000)	(27,000)	83,000	(27,000)
Other comprehensive income (loss) before reclassifications	(5,000)	(27,000)	(51,000)	(138,000)	352,000	10,000
Net losses (gains) reclassified from accumulated other comprehensive loss	(1,000)				3,000
Other comprehensive (loss) income	(6,000)	(27,000)	(51,000)	(138,000)	355,000	10,000
Ending balance	(1,000)	5,000	32,000	200,000	338,000	(17,000)	(1,000)	200,000
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	5,000	32,000	83,000	338,000	(17,000)	(27,000)	83,000	(27,000)
Other comprehensive (loss) income	(6,000)	(27,000)	(51,000)	(138,000)	355,000	10,000
Ending balance	$ (1,000)	$ 5,000	$ 32,000	$ 200,000	$ 338,000	$ (17,000)	$ (1,000)	$ 200,000

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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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