Stockholders' equity (Tables)

9 Months Ended

Sep. 30, 2014

Stockholders' Equity Note [Abstract]

Schedule of Option and Warrant Outstanding

Shares Outstanding		Weighted Average Exercise Price		Expiration Period
	81,978		7.77	4th Qtr, 2014
	78,099		7.81	1st Qtr, 2015
	10,599		10.02	2nd Qtr, 2015
	83,917		3.99	3rd Qtr, 2015
	479,245		7.54	4th Qtr, 2015
	872,800		7.24	1st Qtr, 2016
	961,032		6.41	2nd Qtr, 2016
	1,263,960		6.84	3rd Qtr, 2016
	521,811		7.78	4th Qtr, 2016
	859,749		6.20	1st Qtr, 2017
	1,076,476		7.66	2nd Qtr, 2017
	1,932,539		6.66	3rd Qtr, 2017
	862,339		6.56	4th Qtr, 2017
	133,333		1.95	4th Qtr, 2018
	22,293,675		1.09	1st Qtr, 2019
	270,000		1.15	2nd Qtr, 2019
	1,163,000		1.16	3rd Qtr, 2019
	133,334		7.05	4th Qtr, 2022
	33,077,886

Schedule of Assumptions for Calculations of Newly Issued Options and Warrants

Expected life (in years)	4.23 years
Weighted average volatility	90.14%
Forfeiture rate	11.43%
Risk-free interest rate	1.41%
Expected dividend rate	0%