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Stock-based Activity (Details 2)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Shares  
Nonvested at beginning of period | shares 2,300,850
Granted | shares 0
Vested | shares (726,952)
Forfeited | shares 0
Nonvested at end of period | shares 1,573,898
Weighted Average Grant-Date Fair Value  
Nonvested at beginning of period | $ / shares $ 2.28
Granted | $ / shares 0
Vested | $ / shares 2.30
Forfeited | $ / shares 0
Nonvested at end of period | $ / shares $ 2.28