Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule Assumptions Used in Black-Scholes Option-Pricing Method (Details)

v3.3.1.900
Stock-Based Compensation - Schedule Assumptions Used in Black-Scholes Option-Pricing Method (Details) - $ / shares
12 Months Ended
Nov. 07, 2013
Jul. 31, 2012
Dec. 31, 2010
Dec. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Expected dividend yield       0.00% 0.00%  
Expected stock-price volatility 58.00% 61.00% 61.00%      
Expected stock-price volatility, Minimum       51.45% 51.45%  
Expected stock-price volatility, Maximum       67.08% 64.24%  
Risk-free interest rate 0.55% 0.57% 2.01%      
Risk-free interest rate, Minimum       0.77% 0.88%  
Risk-free interest rate, Maximum       2.27% 3.04%  
Expected term of options 3 years 4 years 5 years 10 years    
Stock price $ 1.17 $ 1.19 $ 1.03     $ 5.86
Minimum [Member]            
Expected term of options         5 years  
Stock price       $ 1.70 $ 1.14  
Maximum [Member]            
Expected term of options         10 years  
Stock price       $ 5.86 $ 5.86