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Summary of Significant Accounting Policies - Schedule of Calculation of Diluted Net Loss Per Share (Detail)	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Common stock options and restricted stock units	Jun. 30, 2013 Common stock options and restricted stock units	Jun. 30, 2014 Common stock warrants	Jun. 30, 2014 Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share amount	1,710,000	1,710,000	9,255,000	12,684,000

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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