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Summary of Option Activity Under Company's Equity Incentive Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Shares Underlying Outstanding Options |  |  |
Number of Shares Underlying Outstanding Options, Beginning Balance | 2,355,615 | 1,577,541 |
Number of Shares Underlying Outstanding Options, Options granted | 1,493,238 | 1,091,250 |
Number of Shares Underlying Outstanding Options, Options exercised | (5,000) | (44,605) |
Number of Shares Underlying Outstanding Options, Options forfeited | (1,239,630) | (250,641) |
Number of Shares Underlying Outstanding Options, Options expired | (593) | (17,930) |
Number of Shares Underlying Outstanding Options, Ending Balance | 2,603,630 | 2,355,615 | 1,577,541
Number of Shares Underlying Outstanding Options, Exercisable- December 31, 2020 | 1,513,039 |  |
Shares available to be granted - December 31, 2020 | 3,333,791 |  |
Weighted- Average Exercise Price |  |  |
Weighted- Average Exercise Price, Beginning Balance | $ 8.59 | $ 10.85 |
Weighted- Average Exercise Price, Options granted | 5.31 | 6.26 |
Weighted- Average Exercise Price, Options exercised | 4.63 | 5.04 |
Weighted- Average Exercise Price, Options forfeited | 6.26 | 10.32 |
Weighted- Average Exercise Price, Options expired | 566.33 | 51.12 |
Weighted- Average Exercise Price, Ending Balance | 7.70 | $ 8.59 | $ 10.85
Weighted- Average Exercise Price, Exercisable - December 31, 2020 | $ 9.37 |  |
Weighted-Average Remaining Contractual Term (Years) |  |  |
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance | 7 years 5 months 15 days | 7 years 11 months 15 days | 8 years 1 month 24 days
Weighted Average Remaining Contractual Term, Exercisable - December 31, 2020 | 6 years 4 months 6 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate Intrinsic Value, Outstanding |  | $ 1,337 | $ 1,350

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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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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