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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Stock-Based Compensation  
Schedule of weighted average assumptions applied to options

 

 

 

 

 

 

 

 

 

 

Three Months Ended

 

 

 

March 31, 

 

 

    

2017

    

2016

 

Average risk free interest rate

 

 
1.7%

 

 
1.5%

 

Expected dividend yield

 

 

—

 

 

—

 

Expected lives (years)

 

 

3.9

 

 

4.1

 

Expected volatility

 

 
86.9%

 

 
93.0%

 

Weighted average grant date fair value of options granted during the period (per share)

 

$

0.99

 

$

1.90

 

Weighted average exercise price of options granted during the period (per share)

 

$

1.59

 

$

2.86