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Fair Value Measurements (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 29, 2015
Jan. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Oct. 31, 2012
Fair Value Disclosures [Abstract]              
Debt instrument, face amount             $ 5,400,000.0
Number of convertible note payable converted in to common stock (in shares) 1,356,738            
Conversion price per share (in dollars per share) $ 4.00            
Stock price at date of conversion (in dollars per share) $ 18.58            
Gain (loss) in estimated fair value of convertible note payable   $ (1,800,000) $ 0 $ 0 $ 0 $ (1,811,000)