Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.8
Subsequent Events - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Nov. 07, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]    
Registration filed on From S-3   $ 100
Registration statement, event description Entered into an at-the-market facility (ATM) to sell up to $25 million of common stock under the registration statement.  
Registration statement, sale on common stock   $ 25