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Certain Financial Statement Caption Information - Schedule of Company's Short-Term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 53,213	$ 58,173
Unrealized Gains	6	12
Unrealized losses	(1)	(4)
Short-term investments	53,218	58,181
U.S. Treasury Securities Maturing in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	50,165	56,218
Unrealized Gains	5	6
Unrealized losses		(4)
Short-term investments	$ 50,170	$ 56,220
U.S. Treasury Securities Maturing in One Year or Less | Maximum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)	1 year	1 year
Certificates of Deposit Maturing in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 490	$ 1,955
Unrealized Gains	1	6
Short-term investments	$ 491	$ 1,961
Certificates of Deposit Maturing in One Year or Less | Maximum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)	1 year	1 year
U.S. Treasury Securities Maturing between One and Five years
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 2,558
Unrealized losses	(1)
Short-term investments	$ 2,557
U.S. Treasury Securities Maturing between One and Five years | Minimum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)	1 year
U.S. Treasury Securities Maturing between One and Five years | Maximum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)	5 years

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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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