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Description of Business, Basis of Consolidation, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Category $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable business category | Category | 1 |  |
Advertising expense | $ 4,833,000 | $ 5,520,000 | $ 4,865,000
Inventory reserve allowance | 2,868,000 | 2,130,000 |
Operating lease expenses | 5,662,000 | 5,547,000 |
Remaining performance obligations | 43,611,000 |  |
Revenue recognized | 5,652,000 | 20,043,000 |
Impairment loss of long-lived assets | 0 | 0 | 0
Goodwill, impairment losses | 0 | 0 | 0
Unrecognized tax benefits | $ 3,222,000 | $ 4,395,000 | $ 2,170,000
Stock options or grants excluded from computation of diluted earning per share | shares | 0 | 0 | 0
Reduction in share based compensation expense | $ 222,000 | $ 191,000 | $ 358,000
Restricted Stock |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Forfeited percentage of stock | 16.80% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares | $ 14.39 | $ 16.84 | $ 20.21
Performance Based Restricted Stock |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Forfeited percentage of stock | 16.80% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares | $ 14.29 | $ 16.96 | $ 18.74
Incentive Stock Options |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Stock options granted | shares | 0 | 0 | 0
Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating lease term | 1 year |  |
Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating lease term | 20 years |  |

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