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Stockholders' Equity - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 26, 2017 | Oct. 22, 2014 | Nov. 01, 2007
Equity [Abstract] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 50,000,000
Stock repurchase program, additional authorized amount |  |  |  |  |  | $ 30,000,000 |
Repurchased shares | 105,750 | 48,687 |  | 0 |  |  |
Repurchased shares, value | $ 729,000 | $ 328,000 | $ 729,000 |  |  |  |
Stock repurchase program, average cost | $ 6.90 | $ 6.73 |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 33,400,000 |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  |  |
Series B Junior Participating Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Right, exercise price (in dollars per share) |  |  |  |  | $ 30.00 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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