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Stock Award Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | May 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | $ 6,203 | $ 6,857 |
Weighted average grant date fair value of the stock options granted | $ 1.32 | $ 1.51 |
Cash received from the exercise of options | $ 124 |  |
Total fair value of restricted stock units vested | 1,100 | $ 1,400 |
Total grant date fair value of restricted stock units outstanding | $ 2,300 | 2,400 |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 10 years |  |
Weighted average vesting period for unrecognized compensation expense | 2 years 10 months 24 days |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Weighted average vesting period for unrecognized compensation expense | 1 year |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 36 months |  |
Vesting rights percentage | 25.00% |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Restricted Stock | Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 25.00% |  |
Performance-based Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation cost |  | $ 1,900 |
Unrecognized compensation expense related to options | $ 1,100 |  |
Options and Performance-based Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to options | 9,900 |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense related to non-option | $ 600 |  |
2018 Equity Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity incentive plan, shares |  |  | 12,000,000

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