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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
	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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