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Stock-Based Compensation - Stock Option - Additional Information (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) installment $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation option awards contractual term | 10 years |  |
Vesting period for subsequent stock options granted to directors | 4 years |  |
Portion of initial stock options granted to employees that vests on employee's first anniversary | 25.00% |  |
Portion of initial stock options granted to employees that vests ratably over three years after completion of first year of service | 75.00% |  |
Number of vesting equal installments | installment | 36 |  |
Options granted, weighted average fair value per share (in dollars per share) | $ / shares | $ 5.53 | $ 10.19 | $ 10.66
Proceeds from exercise of stock options | $ 5,634 | $ 6,264 | $ 6,256
Service option awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Full acceleration of vesting, employee or executive officer subject to involuntary termination, period post change of control of the Company | 24 months |  |
Unrecognized compensation expenses | $ 6,900 |  |
Unrecognized compensation expenses, weighted average period | 1 year 2 months 12 days |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of option 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 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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