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Summary of Significant Accounting Policies - Common Stock Equivalents Excluded in Calculation of Diluted Loss Per Share (Detail) (Stock Options [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities excluded from computation of earnings per share	1,621,168	941,279

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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