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Stockholders' Equity - Stock Options assumptions (Details) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value Assumptions      
Expected volatility 102.03% 93.02%  
Risk-free interest rate 2.65% 2.12%  
Weighted-average expected life (in years) 6 years 4 months 24 days 6 years 3 months 18 days  
Dividend yield 0.00% 0.00%  
1997 And 2007 Plans | Service Based Options      
Additional disclosures      
Vesting period 4 years    
1997 And 2007 Plans | Service Based Options | Service based vesting, first period      
Additional disclosures      
Vesting period 2 years    
Shares that will vest (as a percentage) 0.50%    
1997 And 2007 Plans | Performance Based Options      
Additional disclosures      
Vesting period 4 years    
2010 Equity Incentive Plan      
Stock-Based Compensation Plans      
Shares authorized and reserved 13,296,563   11,850,563
2010 Equity Incentive Plan | Minimum      
Additional disclosures      
Vesting period 3 years    
2010 Equity Incentive Plan | Maximum      
Additional disclosures      
Vesting period 4 years