Fair Value Measurements - Cost, Unrealized Gains and Losses and Fair Value (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost
Amortized Cost	$ 42,526,000
Unrealized Losses	(29,000)
Unrealized Gains	5,000
Fair Value	42,502,000
Amounts recognized on the consolidated balance sheet
Short-term marketable securities	31,561,000	$ 0
Long-term marketable securities	10,941,000	0
Fair Value	42,502,000	$ 0
U.S. Government agency bonds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost
Amortized Cost	20,509,000
Unrealized Losses	(28,000)
Unrealized Gains	0
Fair Value	20,481,000
Corporate bonds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost
Amortized Cost	2,915,000
Unrealized Losses	(1,000)
Unrealized Gains	0
Fair Value	2,914,000
Commercial paper
Debt Securities, Available-for-sale, Fair Value to Amortized Cost
Amortized Cost	19,102,000
Unrealized Losses	0
Unrealized Gains	5,000
Fair Value	$ 19,107,000

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Fair Value Recognized On Balance Sheet

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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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