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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 50,041	$ 61,506	$ 85,114	$ 80,747	$ 61,506	$ 80,747
Other comprehensive income (loss) before reclassifications	(27)	(51)	352	10
Net losses (gains) reclassified from accumulated other comprehensive loss			3
Other comprehensive (loss) income	(27)	(51)	355	10	(78)	365
Ending balance	36,640	50,041	81,752	85,114	36,640	81,752
Gross realized gains, available for sale securities			23
Gross realized losses, available for sale securities						6
Proceeds from sale of debt securities, available-for-sale			9,404
Unrealized gains (losses) on short-term investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	32	83	(17)	(27)	83	(27)
Other comprehensive income (loss) before reclassifications	(27)	(51)	352	10
Net losses (gains) reclassified from accumulated other comprehensive loss			3
Other comprehensive (loss) income	(27)	(51)	355	10
Ending balance	5	32	338	(17)	5	338
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	32	83	(17)	(27)	83	(27)
Other comprehensive (loss) income	(27)	(51)	355	10
Ending balance	$ 5	$ 32	$ 338	$ (17)	$ 5	$ 338

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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 realized loss 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 after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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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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Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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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