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Restricted Stock Activity (Detail)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Number of Shares  
Unvested at beginning of period | shares 42,750
Vested/Released | shares (42,750)
Weighted-Average Grant-Date Fair Value  
Unvested at beginning of period | $ / shares $ 1.61
Vested/Released | $ / shares $ 1.61