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Business Segment, Geographic and Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 24,207 | $ 33,555 | $ 29,092 | $ 22,484 | $ 26,614 | $ 24,907 | $ 20,911 | $ 25,212 |  |  |
Cost of sales | 13,787 | 18,455 | 17,227 | 13,052 | (17,128) | (14,671) | (11,880) | (13,220) |  |  |
Net (loss) income | $ 406 | $ 3,480 | $ 1,236 | $ (21) | $ (29) | $ 1,194 | $ 68 | $ 1,543 | $ 5,101 | $ 2,776 | $ 6,148
Net income per common share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.02 | $ 0.16 | $ 0.06 | $ 0.00 | $ 0.00 | $ 0.05 | $ 0.00 | $ 0.07 | $ 0.23 | $ 0.12 | $ 0.26
Diluted | $ 0.02 | $ 0.15 | $ 0.05 | $ 0.00 | $ 0.00 | $ 0.05 | $ 0.00 | $ 0.06 | $ 0.23 | $ 0.12 | $ 0.25

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