Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

Equity (Details) (USD $)	3 Months Ended
Equity (Details) (USD $)	Mar. 31, 2015
Warrant [Member]
Summary of stock option activities
Number of Units, Beginning balance	7,634,058
Granted	3,333,333
Exercised	(1,080,843)
Number of Units, Ending Balance	9,886,548
Exercisable	9,599,811
Weighted Average Exercise Price, Beginning balance	$ 1.64
Weighted Average Exercise Price, Granted	$ 6.50
Weighted Average Exercise Price, Ending Balance	$ 3.43
Weighted Average Exercise Price, Exercisable	$ 3.30
Weighted Average Remaining Contractual Term (in years), Outstanding, Beginning balance	3 years 11 months 19 days
Weighted Average Remaining Contractual Term (in years), Issued	3 years 10 months 13 days
Weighted Average Remaining Contractual Term (in years), Outstanding, Ending balance	3 years 8 months 9 days
Weighted Average Remaining Contractual Term (in years), Exercisable	3 years 6 months 11 days
Aggregate Intrinsic Value, Beginning balance	$ 34,317,224
Aggregate Intrinsic Value, Granted
Aggregate Intrinsic Value, Exercised
Aggregate Intrinsic Value, Ending Balance	8,239,536
Aggregate Intrinsic Value, Exercisable	8,239,536
Stock Options [Member]
Summary of stock option activities
Number of Units, Beginning balance	3,013,084
Granted	536,000
Number of Units, Ending Balance	3,549,084
Exercisable	1,143,885
Weighted Average Exercise Price, Beginning balance	$ 5.98
Weighted Average Exercise Price, Granted	$ 3.57
Weighted Average Exercise Price, Ending Balance	$ 5.62
Weighted Average Exercise Price, Exercisable	$ 2.79
Weighted Average Remaining Contractual Term (in years), Outstanding, Beginning balance	8 years 4 months 6 days
Weighted Average Remaining Contractual Term (in years), Issued	9 years 10 months 21 days
Weighted Average Remaining Contractual Term (in years), Outstanding, Ending balance	8 years 4 months 13 days
Weighted Average Remaining Contractual Term (in years), Exercisable	6 years 11 months 27 days
Aggregate Intrinsic Value, Beginning balance	4,728,842
Aggregate Intrinsic Value, Exercised
Aggregate Intrinsic Value, Ending Balance	1,398,935
Aggregate Intrinsic Value, Exercisable	$ 1,102,619