Quarterly report pursuant to Section 13 or 15(d)

Unvested Restricted Stock (Detail)

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Unvested Restricted Stock (Detail) (Restricted Stock Units (RSUs), USD $)
6 Months Ended
Jun. 30, 2012
Restricted Stock Units (RSUs)
 
Number of Shares  
Beginning Balance 1,556,000
Granted 385,000
Vested   
Forfeited   
Expired   
Ending Balance 1,941,000
Weighted Average Grant-Date Fair Value  
Beginning Balance $ 2.48
Granted $ 3.16
Vested   
Forfeited   
Expired   
Ending Balance $ 2.62