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Schedule of Common Stock Shares Reserved for Issuance and Shares Available for Grant (Detail) - shares | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Shares of common stock reserved for issuance under the plans | 3,973,228 | 3,973,228 | 3,048,877
Shares of common stock available for future grants | 2,187,101 | 2,325,102 | 1,891,231

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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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