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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Total weighted-average remaining vesting period in years	1 year 18 days	1 year 6 months 10 days	2 years 3 months
Stock-based compensation expense - Cost of Sales	$ 141,000	$ 317,000	$ 321,000
Stock-based compensation expense - SG&A	71,000	108,000	836,000
Income tax benefit	$ (54,000)	$ (164,000)	$ (444,000)

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in cost of sales.

+ References

No definition available.

+ Details

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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in SG&A.

+ References

No definition available.

+ Details

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X

- Definition

The weighted-average period between the balance sheet date and the dates when options outstanding will be fully vested, in 'PnYnMnDnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- References

No definition available.

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