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Stockholders' Equity (Details 4) - Restricted Stock [Member]
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Restricted Shares, Outstanding at January 1, 2016 | shares 3,530,485
Number of Restricted Shares, Granted | shares 265,243
Number of Restricted Shares, Canceled | shares 0
Number of Restricted Shares, Vested | shares (189,900)
Number of Restricted Shares, Expired/Forfeited | shares (11,275)
Number of Restricted Shares, Outstanding at June 30, 2016 | shares 3,594,553
Weighted-Average Exercise Price, Outstanding at January 1, 2016 | $ / shares $ 4.95
Weighted-Average Grant Date Fair Value, Granted | $ / shares 5.8
Weighted-Average Grant Date Fair Value, Canceled | $ / shares 0
Weighted-Average Grant Date Fair Value, Vested | $ / shares 5.05
Weighted-Average Grant Date Fair Value, Expired/Forfeited | $ / shares 8.63
Weighted-Average Exercise Price, Outstanding at June 30, 2016 | $ / shares $ 5