Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Marketable Securities - Additional Information (Detail)

v2.4.0.6
Fair Value Measurements and Marketable Securities - Additional Information (Detail)
9 Months Ended
Sep. 30, 2012
D
Schedule of Available-for-sale Securities [Line Items]  
Weighted average days to maturity 157
Warrants to purchase outstanding common stock 11,700,000
Maximum [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available for sale securities, longest maturity date 2013-12