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Summary of Significant Accounting Policies - Outstanding Options, Warrants and Restricted Stock Units (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	20,022,199	11,917,471	18,667,522
Options [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	428,258	447,359	875,498
Restricted stock units [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	3,326,282	1,534,200	357,541
Outstanding warrants [Member]
Class of Stock [Line Items]
Outstanding options, warrants and restricted stock units	16,267,659	9,935,912	17,434,483

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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