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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale debt securities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost	$ 197,149,000	$ 23,179
Unrealized Gains	21,000	173
Unrealized Losses	(1,428,000)	(43)
Fair Value	195,742,000	23,309
U.S. Treasury notes
Amortized Cost	124,171,000	23,179
Unrealized Gains	13,000	173
Unrealized Losses	(802,000)	(43)
Fair Value	123,382,000	$ 23,309
U.S. Treasury bills
Amortized Cost	29,987,000
Unrealized Gains	8,000
Fair Value	29,995,000
Corporate debt securities
Amortized Cost	42,991,000
Unrealized Losses	(626,000)
Fair Value	$ 42,365,000

X

- Definition

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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