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Warrants (Tables)
12 Months Ended
Dec. 31, 2017
Warrants  
Schedule of warrant activity

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

average

 

 

 

Warrants

 

exercise price

 

Outstanding at December 31, 2014

 

230,409

 

$

1.30

 

Issued

 

42,059

 

 

5.94

 

Outstanding at December 31, 2015

 

272,468

 

 

2.02

 

Issued

 

65,228

 

 

7.41

 

Outstanding at December 31, 2016

 

337,696

 

 

3.06

 

Issued

 

1,890,602

 

 

5.33

 

Exercised

 

(129,149)

 

 

1.30

 

Outstanding at December 31, 2017

 

2,099,149

 

$

5.21

 

 

Summary of equity instruments fair value inputs

 

 

 

 

Black-Scholes option valuation assumptions

    

2016

 

Risk-free interest rate

 

1.8

%

Dividend yield

 

 

Volatility

 

73

%

Weighted average contractual term

 

7 years