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Investments and Fair Value Instruments - Summary of Amortized Cost and Fair Value of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 23,051	$ 24,678
Unrealized Gains	656	1
Unrealized Losses	0	0
Estimated Fair Value	23,707	24,679
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	12,082	6,864
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	12,082	6,864
Cash Equivalents [Member] | Commercial Paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		900
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value		900
Short-term Investments [Member] | Commercial Paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		12,119
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value		12,119
Short-term Investments [Member] | Treasury Bills [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		1,495
Unrealized Gains		1
Unrealized Losses		0
Estimated Fair Value		1,496
Short-term Investments [Member] | Corporate Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	10,969	3,300
Unrealized Gains	656	0
Unrealized Losses	0	0
Estimated Fair Value	$ 11,625	$ 3,300

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