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Stock-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 15, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares allocated for issuance to directors, officers and key personnel | 3,900,000 |  |  |
Stock split conversion ratio | 2 |  |  |
Stock split description | two-for-one | Two-for-one |  |
Shares available for future grants | 217,000 |  |  |
Vesting period | 5 years |  |  |
Expiration period | 10 years |  |  |
Aggregate intrinsic value of stock options | $ 9,600,000 |  |  |
Intrinsic value of vested and expected to vest stock options | 3,000,000 |  |  |
Intrinsic value of options exercised | 44,000 | $ 373,000 | $ 522,000 |
Measurement date fair value of stock options vested | $ 529,000 | $ 228,000 | $ 198,000 |
Number of Options, Granted | 683,000 | 495,000 | 0 |
Dividend yield assumption | 0.00% | 0.00% |  |
Expected term (in years) | 5 years | 5 years | 0 years |
Stock-based compensation expense | $ 936,000 | $ 470,000 | $ 381,000 |
Tax benefits | 252,000 | $ 128,000 | $ 141,000 |
Expenses related to non-vested stock options | $ 3,000,000 |  |  |
Weighted-average remaining requisite service period | 3 years 7 months 6 days |  |  |
Price per share | $ 11.07 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grants | 559,500 |  |  | 600,000
Price per share | $ 4.11 |  |  |
Number of shares issued related to employee stock purchases | 40,500 |  |  |
Percentage of maximum contribution of salary towards plan | 15.00% |  |  |
Maximum contribution towards plan | $ 25,000 |  |  |
Discount on purchase of common stock | 15.00% |  |  |
Fair value estimation | The fair value of the six-month “look-back” option in the Company’s employee stock purchase plans is estimated by adding the fair value of $0.15 of one share of stock to the fair value of $0.85 of an option on one share of stock. |  |  |
Stock Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of outstanding and/or exercised stock options | 3,180,000 |  |  |
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units released or outstanding vested | 260,000 |  |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units released or outstanding | 243,000 |  |  |
Restricted Stock Units Activity [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate intrinsic value of restricted stock units outstanding | $ 368,000 |  |  |
Intrinsic value of restricted shares released | 111,000 |  |  |
Unrecognized compensation expense | $ 133,000 |  |  |

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