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Investments and Fair Value Instruments - Summary of Fair Value of Investments Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets at Fair Value
Total Assets at Fair Value	$ 23,707	$ 24,679
Treasury Bills [Member]
Assets at Fair Value
Short-term investments		1,496
Money Market Funds [Member]
Assets at Fair Value
Cash equivalents	12,082	6,864
Corporate Securities [Member]
Assets at Fair Value
Short-term investments	11,625	3,300
Commercial Paper [Member]
Assets at Fair Value
Cash equivalents		900
Short-term investments		12,119
Level 1 [Member]
Assets at Fair Value
Total Assets at Fair Value	23,707	8,360
Level 1 [Member] | Treasury Bills [Member]
Assets at Fair Value
Short-term investments		1,496
Level 1 [Member] | Money Market Funds [Member]
Assets at Fair Value
Cash equivalents	12,082	6,864
Level 1 [Member] | Corporate Securities [Member]
Assets at Fair Value
Short-term investments	11,625	0
Level 1 [Member] | Commercial Paper [Member]
Assets at Fair Value
Cash equivalents		0
Short-term investments		0
Level 2 [Member]
Assets at Fair Value
Total Assets at Fair Value	0	16,319
Level 2 [Member] | Treasury Bills [Member]
Assets at Fair Value
Short-term investments		0
Level 2 [Member] | Money Market Funds [Member]
Assets at Fair Value
Cash equivalents	0	0
Level 2 [Member] | Corporate Securities [Member]
Assets at Fair Value
Short-term investments	0	3,300
Level 2 [Member] | Commercial Paper [Member]
Assets at Fair Value
Cash equivalents		900
Short-term investments		12,119
Level 3 [Member]
Assets at Fair Value
Total Assets at Fair Value	0	0
Level 3 [Member] | Treasury Bills [Member]
Assets at Fair Value
Short-term investments		0
Level 3 [Member] | Money Market Funds [Member]
Assets at Fair Value
Cash equivalents	0	0
Level 3 [Member] | Corporate Securities [Member]
Assets at Fair Value
Short-term investments	$ 0	0
Level 3 [Member] | Commercial Paper [Member]
Assets at Fair Value
Cash equivalents		0
Short-term investments		$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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