Certain Financial Statement Caption Information - Schedule of Company's Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 41,240	$ 39,875
Unrealized Gains	53	55
Unrealized losses	(5)	(6)
Short-term investments	41,288	39,924
U.S. Treasury Securities Maturing in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	37,095	23,513
Unrealized Gains	29	6
Unrealized losses	(5)	(4)
Short-term investments	$ 37,119	$ 23,515
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
Agency Securities Maturing in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		$ 5,976
Unrealized Gains		19
Unrealized losses		(1)
Short-term investments		$ 5,994
Agency Securities Maturing in One Year or Less \| Maximum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)		1 year
Certificates of Deposit Maturing in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 4,145	$ 4,131
Unrealized Gains	24	22
Short-term investments	$ 4,169	$ 4,153
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		$ 5,035
Unrealized losses		(1)
Short-term investments		$ 5,034
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
Certificates of Deposit Maturing between One and Five Years
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		$ 1,220
Unrealized Gains		8
Short-term investments		$ 1,228
Certificates of Deposit Maturing between One and Five Years \| Minimum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)		1 year
Certificates of Deposit Maturing between One and Five Years \| Maximum
Schedule Of Available For Sale Securities [Line Items]
Maturity (in years)		5 years

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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