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Organization and Other Matters - Schedule of Impact on Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Dec. 30, 2018
Nature Of Business And Basis Of Presentation [Line Items]
Allowances on accounts receivable	$ 131		$ 113
Common stock, par value	$ 0.01		$ 0.01
Common stock, authorized	200,000,000		200,000,000
Common stock, outstanding	23,768,375		24,142,586
Treasury stock, shares	9,291,732		8,801,154
ASU 2016-02 (Topic 842) [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Net reduction to opening accumulated deficit		$ 500

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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