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Stockholders' Equity - Stock Options assumptions (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assumptions        
Expected volatility   98.83% 106.38% 102.86%
Risk-free interest rate   1.47% 1.55% 1.98%
Weighted-average expected life (in years)   6 years 7 months 6 days 6 years 4 months 24 days 6 years 7 months 6 days
Dividend yield   0.00% 0.00% 0.00%
Value of options granted during period   $ 2,838,053 $ 4,884,534  
P. Ron Ellis        
Fair Value Assumptions        
Additional compensation cost due to modification $ 2,800,000      
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        
Stock-Based Compensation Plans        
Shares authorized and reserved   11,003,563 9,742,563  
2010 Equity Incentive Plan | Minimum        
Additional disclosures        
Vesting period   3 years    
2010 Equity Incentive Plan | Maximum        
Additional disclosures        
Vesting period   4 years