Convertible Notes - Summary of Probability Weighted Discounted Cash Flow Analyses Utilized Assumptions Related to Probability of Occurrence of Each of Various Events and Appropriate Discount Rates for Each of Scenarios (Detail)	12 Months Ended
	Dec. 31, 2013
IPO Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	Jun. 30, 2014
Estimated probability of future event	45.00%
IPO Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	Mar. 31, 2015
Estimated probability of future event	5.00%
Sale Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	Jun. 30, 2014
Estimated probability of future event	15.00%
Sale Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	Mar. 31, 2015
Estimated probability of future event	15.00%
Dissolution [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	Sep. 30, 2014
Estimated probability of future event	5.00%
Private Company [Member]
Debt Instrument [Line Items]
Estimated probability of future event	15.00%