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Fair Value Measurements - Fair Value of Outstanding Common Stock Warrants (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
Fair Value Disclosures [Abstract]  
Stock price (in usd per share) $ 23.54
Weighted average exercise price (in usd per share) $ 0.10
Term (years) 6 years 8 months
Risk-free rate 2.04%
Expected volatility 43.00%