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Investment Securities and Fair Value Measurements - Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 34,951	$ 34,920
Gross Unrealized Gains	76	47
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	$ 35,026	$ 34,965
Investment contractual maturities	36 months	36 months
Amortized cost, due in one year or less	$ 28,197	$ 22,846
Estimated fair value, due in one year or less	28,256	22,876
Amortized cost, due after one year through three years	6,754	12,074
Estimated fair value, due after one year through three years	6,770	12,089
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		9,597
Gross Unrealized Gains		18
Gross Unrealized Losses		(1)
Estimated Fair Value		9,614
Agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,104	11,101
Gross Unrealized Gains	29	17
Gross Unrealized Losses	(1)	0
Estimated Fair Value	17,132	11,118
Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,847	14,222
Gross Unrealized Gains	47	12
Gross Unrealized Losses	0	(1)
Estimated Fair Value	$ 17,894	$ 14,233

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