Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Restricted Stock Activity (Detail)

v2.4.0.8
Common Stock - Restricted Stock Activity (Detail) (Restricted Stock [Member], USD $)
3 Months Ended
Mar. 31, 2014
Restricted Stock [Member]
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Unvested balance at December 31, 2013 3,958,692
Number of Shares, Restricted stock granted 4,343,692
Number of Shares, Unvested balance at March 31, 2014 8,302,384
Weighted Average Grant Date Fair Value, Unvested balance at December 31, 2013 $ 1.93
Weighted Average Grant Date Fair Value, Restricted stock granted $ 2.69
Weighted Average Grant Fair Value, Unvested balance at March 31, 2014 $ 2.33