Net loss per share (Tables)

6 Months Ended

Jun. 30, 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 Six Months Ended
	June 30, 2015	June 30, 2014
Stock options	107,600	71,987
Warrants	224,662	105,230
Preferred shares as if converted
Series A-1 Preferred Stock	6,502	7,664
Series B Preferred Stock	296,945	269,105
Series C Preferred Stock	232,203	210,412
Series D-1 Preferred Stock	326,987	195,956
Series D-2 Preferred Stock	121,409	108,713