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Quarterly Financial Information - Company's Consolidated Quarterly Results of Operations (Detail) (USD $) | 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 14,906,000 | $ 20,232,000 | $ 12,299,000 | $ 10,598,000 | $ 9,799,000 | $ 16,082,000 | $ 17,435,000 | $ 20,510,000 | $ 58,034,668 | $ 63,826,098 | $ 57,207,366
Net income (loss) | $ (3,205,000) | $ 6,604,000 | $ (294,000) | $ (3,366,000) | $ (2,105,000) | $ 2,601,000 | $ 3,546,000 | $ 4,320,000 | $ (260,835) | $ 8,361,755 | $ 6,717,120
Net income (loss) per share, basic | $ (0.14) | $ 0.14 | $ (0.24) | $ (2.93) | $ (1.92) | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.04) | $ 0.00 | $ 0.00
Net income (loss) per share, diluted | $ (0.14) | $ 0.01 | $ (0.24) | $ (2.93) | $ (1.92) | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.04) | $ 0.00 | $ 0.00

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