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Equity Instruments and Stock Based Compensation (Details 3)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Warrants exercisable, December 31, 2015, Weighted Average Remaining Contractual Life 6 years 1 month 13 days
Warrants outstanding, December 31, 2015, Aggregate Intrinsic Value | $ $ 6,426
Warrant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Warrants outstanding, January 1, 2015 | shares 553
Granted | shares 305
Exercised | shares (190)
Forfeited | shares 0
Warrants outstanding, December 31, 2015 | shares 668
Warrants exercisable, December 31, 2015 | shares 363
Warrants outstanding, January 1, 2015, Weighted Average Exercise Price | $ / shares $ 10.47
Granted, Weighted Average Exercise Price | $ / shares 21.67
Exercised, Weighted Average Exercise Price | $ / shares 5.57
Forfeited, Weighted Average Exercise Price | $ / shares 0
Warrants outstanding, December 31, 2015, Weighted Average Exercise Price | $ / shares 16.97
Warrants exercisable, December 31, 2015, Weighted Average Excercise Price | $ / shares $ 13.04
Warrants outstanding, December 31, 2015, Weighted Average Remaining Contractual Life 2 years 10 months 24 days
Warrants exercisable, December 31, 2015, Weighted Average Remaining Contractual Life 2 years 4 months 28 days
Warrants outstanding, December 31, 2015, Aggregate Intrinsic Value | $ $ 687
Warrants exercisable, December 31, 2015, Aggregate Intrinsic Value | $ $ 687