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Stockholders' Equity - Stock Options (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Stock-Based Compensation Plans          
Shares authorized and reserved 11,003,563   11,003,563   9,742,563
Fair Value Assumptions          
Expected volatility 95.90% 103.00% 99.00% 106.50%  
Risk-free interest rate 1.27% 1.77% 1.47% 1.55%  
Weighted-average expected life (in years) 6 years 3 months 18 days 6 years 3 months 18 days 6 years 7 months 6 days 6 years 4 months 24 days  
Dividend yield 0.00% 0.00% 0.00% 0.00%  
P. Ron Ellis          
Fair Value Assumptions          
Additional compensation cost due to modification     $ 2.8    
1997 And 2007 Plans | Service based vesting          
Additional disclosures          
Vesting period     4 years    
1997 And 2007 Plans | Service based vesting, first period          
Additional disclosures          
Vesting period     2 years    
Shares that will vest (as a percentage)     50.00%    
1997 And 2007 Plans | Performance based vesting          
Additional disclosures          
Vesting period     4 years    
2010 Equity Incentive Plan | Minimum [Member]          
Additional disclosures          
Vesting period     3 years    
2010 Equity Incentive Plan | Maximum          
Additional disclosures          
Vesting period     4 years