Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Schedule of Weighted-Average Assumptions Used for Calculating Value of Options Granted (Detail)

v3.2.0.727
Stock-based Compensation - Schedule of Weighted-Average Assumptions Used for Calculating Value of Options Granted (Detail) - Jun. 30, 2015
Total
Total
Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract]    
Forfeiture rate 6.00% 6.00%
Dividend yield 0.00% 0.00%
Expected volatility 73.70% 74.10%
Weighted average risk-free interest rate 1.73% 1.71%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract]    
Expected term 5 years 3 months 18 days 5 years 3 months 18 days
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract]    
Expected term 5 years 9 months 18 days 5 years 9 months 18 days