Net loss per share (Tables)

3 Months Ended

Mar. 31, 2015

Net loss per share [Abstract]

Schedule of Antidilutive Securities Excluded from Calculation of Earnings Per Share

The following table lists shares and warrants that were excluded from the calculation of dilutive earnings per share as the exercise of such options and warrants and the conversion of such preferred shares would be anti-dilutive:

	For the three Months Ended
	March 31, 2015	March 31, 2014
Stock options	107,645	72,037
Warrants	230,012	94,240
Preferred shares as if converted
Series A-1 Preferred Stock	6,375	7,513
Series B Preferred Stock	289,722	17,065
Series C Preferred Stock	226,555	205,294
Series D-1 Preferred Stock	319,033	191,189
Series D-2 Preferred Stock	118,428	106,069