Shareholders' Equity Stock options and warrants (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) $ / shares $ / warrant shares	Dec. 31, 2015 USD ($) $ / shares $ / warrant shares	Mar. 10, 2016 shares
Stock Options and Warrants [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 202,700	$ 100
Common Stock Warrants, Shares	4,605,473	3,214,033	1,400,000
Weighted Average Exercise Price, Warrants Outstanding | $ / warrant	9.80	13.72
Weighted Average Remaining Contractual Term warrant outstanding	1 year 3 months 22 days	1 year 3 months 4 days
Aggregate Intrinsic Value, Warrants Outstanding | $	$ 0	$ 0
Warrants Granted	1,418,440
Warrants Canceled	27,000
Weighted Average Exercise Price, Warrants Granted | $ / shares	$ 1.00
Warrants Exercised	0
Weighted Average Exercise Price, Warrants Exercised | $ / shares	$ 0.00
Warrants Expired	0
Weighted Average Exercise Price, Warrants Expired | $ / shares	$ 0.00
Weighted Average Exercise Price, Warrants Canceled | $ / shares	$ 14.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $	$ 189,300
shares, vested and expected to vest	4,605,473
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant	9.80
Aggregate Intrinsic Value, Warrants vested and expected to vest | $	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $	$ 52,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	4,605,473
Weighted Average Exercise Price, Warrants Exercisable | $ / warrant	9.80
weighted Average Remaining Contractual Term, warrants vested	1 year 3 months 22 days
Aggregate Intrinsic Value, Warrants vested | $	$ 0
US Equity Plan [Member]
Stock Options and Warrants [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	7,228,792	6,663,480
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 5.48	$ 6.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 4 months 6 days	6 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	1,552,875
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 0.62
Stock Options Exercised	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares	$ 0.00
Stock Options Expired	(442,466)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ / shares	$ 3.79
Stock Options Forfeited	(545,097)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares	$ 5.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	7,020,566
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 5.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	7 years 3 months 15 days
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest	1 year 3 months 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	4,995,506
Weighted average estimated fair value of shares granted | $ / shares	$ 7.15
Options, Vested, weighted Average Remaining Contractual Term	6 years 5 months 1 day