Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.0.814
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounting Policies [Abstract]      
Cash and cash equivalents, maturity description 90 days or less    
Short-term contractual maturities 1 year    
Restricted cash $ 170,000   $ 100,000
Interest or penalties related to income taxes $ 0 $ 0