Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Fair Value Measurements and Marketable Securities - Additional Information (Detail)
12 Months Ended
Dec. 31, 2012
D
Schedule of Available-for-sale Securities [Line Items]  
Weighted average days to maturity 133
Shares of common stock to be purchased with warrants 11,600,000
Maximum [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available for sale securities, longest maturity date 2014-04