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Description of Business, Basis of Consolidation, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |
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Jan. 01, 2019 | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Category $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jan. 01, 2018 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable business category | Category |  |  |  |  |  |  |  |  |  | 1 |  |  |
Advertising expense |  |  |  |  |  |  |  |  |  | $ 4,865,000 | $ 3,020,000 | $ 2,271,000 |
Inventory reserve allowance |  | $ 1,989,000 |  |  |  | $ 3,137,000 |  |  |  | 1,989,000 | 3,137,000 |  |
Remaining performance obligations |  | 23,793,000 |  |  |  |  |  |  |  | 23,793,000 |  |  |
Revenue recognized |  |  |  |  |  |  |  |  |  | 14,063,000 |  |  |
Net sales |  | 131,338,000 | $ 111,780,000 | $ 107,046,000 | $ 104,108,000 | 116,494,000 | $ 89,975,000 | $ 77,905,000 | $ 70,673,000 | 454,272,000 | 355,047,000 | 312,113,000 |
Accrued program costs |  | 37,349,000 |  |  |  | 39,054,000 |  |  |  | 37,349,000 | 39,054,000 |  |
Impairment loss of long-lived assets |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Goodwill, impairment losses |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Unrecognized tax benefits |  | $ 2,170,000 |  |  |  | $ 2,118,000 |  |  |  | $ 2,170,000 | $ 2,118,000 | $ 1,893,000 |
Stock options or grants excluded from computation of diluted earning per share | shares |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Reduction in share based compensation expense |  |  |  |  |  |  |  |  |  | $ 358,000 | $ 177,000 | $ 118,000 |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited percentage of stock |  |  |  |  |  | 16.20% |  |  |  |  | 16.20% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares |  |  |  |  |  |  |  |  |  | $ 20.21 | $ 16.24 | $ 15.22 |
Performance Based Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited percentage of stock |  |  |  |  |  | 16.10% |  |  |  |  | 16.10% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares |  |  |  |  |  |  |  |  |  | $ 18.74 | $ 15.43 |  |
Incentive Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited percentage of stock |  |  |  |  |  | 8.00% |  |  |  |  | 8.00% |  |
Stock options granted | shares |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Accounting Standards Update 2014-09 | Impact of Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 43,000 |  |  |
Adopted ASU 2016-16 |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction to retained earning |  |  |  |  |  |  |  |  |  |  |  |  | $ (180,000)
ASU No. 2016-02, Topic 842 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net lease assets and lease liabilities on total assets | 2.50% |  |  |  |  |  |  |  |  |  |  |  |

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