Stockholders' Equity (Details 4) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Number of Warrants
Balance of warrants outstanding at the beginning of the period (in shares)	5,533,242
Exercised (in shares)	(50,000)
Balance of warrants outstanding at the end of the period (in shares)	5,483,242	5,533,242
Weighted Average Exercise Price Per Share
Weighted average exercise price of warrants at the beginning of the period (in USD per share)	$ 3.86
Exercised (in USD per share)	8.00
Weighted average exercise price of warrants at the end of the period (in USD per share)	$ 3.82	$ 3.86
Term
Weighted Average Remaining Contractual Term	2 years 3 months 18 days	2 years 6 months