Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Fair Value Assumptions) (Details)

v3.7.0.1
Stockholders' Equity (Fair Value Assumptions) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Expected volatility, minimum (as a percent) 85.00% 67.00%
Expected volatility, maximum (as a percent) 90.00% 78.00%
Risk-free interest rate, minimum (as a percent) 1.30% 1.50%
Risk-free interest rate, maximum (as a percent) 1.40% 1.80%
Expected dividend yield (as a percent) 0.00% 0.00%
Minimum [Member]    
Expected term 5 years 5 years
Maximum [Member]    
Expected term 6 years 6 years