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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders Equity Note [Abstract]  
Schedule of Warrant Valuation Assumptions [Table Text Block]

The fair value of the Private Placement and Placement Agent warrants were estimated using a Monte Carlo Simulation approach using the following assumptions.

 

 

 

December 31, 2016

 

 

 

April 14, 2016

 

 

Private Placement Warrants

 

 

 

 

 

 

 

 

 

 

Stock Price

 

$

2.70

 

 

 

$

4.45

 

 

Exercise Price

 

$

4.00

 

 

 

$

4.98

 

 

Remaining term (in years)

 

 

6.29

 

 

 

 

7.00

 

 

Volatility

 

 

51.40

 

%

 

 

46.90

 

%

Risk-free interest rate

 

 

2.14

 

%

 

 

1.57

 

%

Expected dividend yield

 

—

 

%

 

—

 

%

Placement Agent Warrants

 

 

 

 

 

 

 

 

 

 

Stock Price

 

$

2.70

 

 

 

$

4.45

 

 

Exercise Price

 

$

3.99

 

 

 

$

3.99

 

 

Remaining term (in years)

 

 

4.29

 

 

 

 

5.00

 

 

Volatility

 

 

56.10

 

%

 

 

49.00

 

%

Risk-free interest rate

 

 

1.77

 

%

 

 

1.26

 

%

Expected dividend yield

 

—

 

%

 

—

 

%