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Net Loss Per Share - Additional Information (Detail)	3 Months Ended
Net Loss Per Share - Additional Information (Detail)	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Dilutive stock options and warrants excluded from dilutive loss per share	7,137,814	10,697,415

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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