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Summary of Significant Accounting Policies - Common Stock Equivalents Excluded in Calculation of Diluted Loss Per Share (Detail) (Stock Options [Member])
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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Stock Options [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Number of anti-dilutive securities excluded from computation of earnings per share | 898,982 | 905,284 |