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Stock-Based Compensation - Summary of Information Regarding the Company's Outstanding and Exercisable Stock Options (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding | 2,009,000 | 1,721,000 | 1,111,000 | 674,000
Weighted Average Remaining Contractual Life (in years) | 7 years 10 months 24 days |  |  |
Weighted Average Exercise Price | $ 9.40 | $ 5.52 | $ 4.95 | $ 3.43
Options Exercisable | 386,000 |  |  |
Weighted average remaining contractual life, options exercisable | 6 years 3 months 18 days |  |  |
Weighted average exercise price, options exercisable | $ 4.93 |  |  |
Range One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding | 355,000 |  |  |
Lower range of exercise price | $ 0.01 |  |  |
Upper range of exercise price | $ 4.00 |  |  |
Weighted Average Remaining Contractual Life (in years) | 5 years 2 months 12 days |  |  |
Weighted Average Exercise Price | $ 3.56 |  |  |
Options Exercisable | 222,000 |  |  |
Range of exercise prices, minimum, options exercisable | $ 0.01 |  |  |
Range of exercise price, maximum, options exercisable | $ 4.00 |  |  |
Weighted average remaining contractual life, options exercisable | 5 years 2 months 12 days |  |  |
Weighted average exercise price, options exercisable | $ 3.59 |  |  |
Range Two [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding | 904,000 |  |  |
Lower range of exercise price | $ 4.01 |  |  |
Upper range of exercise price | $ 8.00 |  |  |
Weighted Average Remaining Contractual Life (in years) | 8 years |  |  |
Weighted Average Exercise Price | $ 6.65 |  |  |
Options Exercisable | 164,000 |  |  |
Range of exercise prices, minimum, options exercisable | $ 4.01 |  |  |
Range of exercise price, maximum, options exercisable | $ 8.00 |  |  |
Weighted average remaining contractual life, options exercisable | 7 years 9 months 18 days |  |  |
Weighted average exercise price, options exercisable | $ 6.74 |  |  |
Range Three [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding | 0 |  |  |
Lower range of exercise price | $ 8.01 |  |  |
Upper range of exercise price | $ 12.00 |  |  |
Weighted Average Remaining Contractual Life (in years) | 0 years |  |  |
Weighted Average Exercise Price | $ 0 |  |  |
Options Exercisable | 0 |  |  |
Range of exercise prices, minimum, options exercisable | $ 8.01 |  |  |
Range of exercise price, maximum, options exercisable | $ 12.00 |  |  |
Weighted average remaining contractual life, options exercisable | 0 years |  |  |
Weighted average exercise price, options exercisable | $ 0 |  |  |
Range Four [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding | 750,000 |  |  |
Lower range of exercise price | $ 12.01 |  |  |
Upper range of exercise price | $ 16.00 |  |  |
Weighted Average Remaining Contractual Life (in years) | 9 years 1 month 6 days |  |  |
Weighted Average Exercise Price | $ 15.49 |  |  |
Options Exercisable | 0 |  |  |
Range of exercise prices, minimum, options exercisable | $ 12.01 |  |  |
Range of exercise price, maximum, options exercisable | $ 16.00 |  |  |
Weighted average remaining contractual life, options exercisable | 0 years |  |  |
Weighted average exercise price, options exercisable | $ 0 |  |  |

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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 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 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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