Quarterly report pursuant to Section 13 or 15(d)

Stock-based Activity (Details)

v3.7.0.1
Stock-based Activity (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Risk-free interest rate 1.80%      
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility 80.00%      
Expected life of options, in years 5 years 6 years   6 years
Weighted average grant date fair value $ 1.14 $ 2.93 $ 1.53 $ 2.93
Minimum [Member]        
Risk-free interest rate   1.20% 1.50% 1.20%
Expected volatility   82.00% 73.00% 82.00%
Expected life of options, in years     1 year 4 months 24 days  
Maximum [Member]        
Risk-free interest rate   1.40% 2.00% 1.40%
Expected volatility   84.00% 85.00% 84.00%
Expected life of options, in years     6 years