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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued upon the exercise of stock options | 1,489,067 | 1,611,731
Share-based compensation expense | $ 7,302 | $ 4,876
Shares issued under the ESPP | 203,061 | 282,101
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period of stock options granted | 10 years |
Weighted-average fair value of stock option awards granted (per share) | $ 3.56 | $ 1.56
Intrinsic value of stock options exercised during period | $ 5,600 | $ 2,400
Unrecognized share-based compensation expense related to non-vested stock options | $ 9,000 |
Expected recognition period | 2 years 9 months 18 days |
Share-based compensation expense | $ 3,500 | 2,500
Stock Options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Stock Options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected recognition period | 10 months 24 days |
Share-based compensation expense | $ 3,500 | $ 2,200
Weighted-average grant-date fair value of RSUs granted (per share) | $ 5.07 | $ 2.01
Total vest date fair value of RSUs vested | $ 4,000 | $ 2,100
Unrecognized share-based compensation expense related to non-vested RSUs | $ 600 |
Restricted Stock Units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Restricted Stock Units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized under the plan | 5,324,000 |
Share-based compensation expense | $ 300 | $ 200
Percentage of lower limit value of common stock | 85.00% |
Purchase period duration | 6 months |
Maximum limit of payroll deductions (percent) | 10.00% |
2015 Incentive Compensation Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized under the plan | 1,946,915 |
2018 Omnibus Incentive Compensation Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized under the plan | 20,576,085 |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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