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Warrants (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Key Terms of Placement Warrants The key terms of the 2017 and 2016 Placement Warrants are as follows:

 

 

Issuance Date

 

Term

 

Exercise Price Per Share

 

 

Warrants Exercised during the Six Months Ended June 30, 2019

 

 

Warrants Outstanding at June 30, 2019

 

2017 Placement Warrants

 

January 2017

 

7 years

 

$

3.17

 

 

 

11,988

 

 

 

1,697,544

 

2016 Placement Warrants

 

August and September 2016

 

7 years

 

$

2.95

 

 

 

236,327

 

 

 

878,739

 

   Total

 

 

 

 

 

 

 

 

 

 

248,315

 

 

 

2,576,283

 

 

Summary of Assumptions using Black- Scholes Option Pricing Model to estimate fair value The fair value of the 2016 and 2017 Placement Warrants at June 30, 2019 and December 31, 2018, respectively, was estimated using the Black-Scholes option-pricing model and the following weighted-average assumptions:

 

 

 

2017 Placement Warrants

 

 

2016 Placement Warrants

 

 

 

June 30, 2019

 

 

December 31,

2018

 

 

June 30, 2019

 

 

December 31,

2018

 

Expected term (in years)

 

 

4.6

 

 

 

5.1

 

 

4.1

 

 

 

4.7

 

Expected volatility

 

57.7%

 

 

60.8%

 

 

58.6%

 

 

60.9%

 

Risk-free interest rate

 

1.7%

 

 

2.5%

 

 

1.7%

 

 

2.5%

 

Expected dividend yield

 

0%

 

 

0%

 

 

0

 

 

0%