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Fair Value Measurements - Summary of Quantitative Information about Fair Value Measurements, Including the Range of Assumptions for the Significant Unobservable Inputs (Detail) - Fair Value, Measurements, Recurring [Member] - Level 3 [Member] - Preferred Stock Warrants [Member]
12 Months Ended
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Time to liquidity event 6 months
Risk-free interest rate 0.12%
Volatility 60.00%
Minority discount 10.00%
Discount for lack of marketability 23.00%