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Stockholders' Equity - Stock Options assumptions (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Stock-Based Compensation Plans        
Shares authorized and reserved   11,850,563   11,003,563
Fair Value Assumptions        
Expected volatility 95.90% 92.70% 99.00%  
Risk-free interest rate 1.27% 2.15% 1.47%  
Weighted-average expected life (in years) 6 years 3 months 18 days 6 years 10 months 24 days 6 years 7 months 6 days  
Dividend yield 0.00% 0.00% 0.00%  
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        
Additional disclosures        
Vesting period   3 years    
2010 Equity Incentive Plan | Maximum        
Additional disclosures        
Vesting period   4 years