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Stock Option Plans, Shares Reserved and Warrants (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jan. 30, 2019
Jan. 02, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Compensation expenses         $ 3,743,248 $ 3,172,078  
2009 Equity Incentive Plan [Member]              
Increase in shares reserved for stock awards   2,364,568          
Options granted         90,000    
Exercise price of options granted (in dollars per share)         $ 3.09    
Stock options outstanding     8,346,058   8,346,058   9,298,101
Intrinsic value of stock options outstanding     $ 0   $ 0   $ 0
Stock options exercisable     6,551,706   6,551,706   6,130,337
Intrinsic value of stock options exercisable     $ 0   $ 0   $ 0
2009 Equity Incentive Plan [Member] | Non-employee Directors [Member]              
Options granted 90,000            
Exercise price of options granted (in dollars per share) $ 3.09            
Vesting period 1 year            
Expected volatility 56.00%            
Term 6 years            
Dividend rate 0.00%            
Risk-free interest rate 2.60%            
Fair value $ 152,000            
2009 Equity Incentive Plan [Member] | RSU [Member]              
Compensation expenses     $ 882,000 $ 305,000 $ 1,684,000 $ 563,000  
2009 Equity Incentive Plan [Member] | RSU [Member] | Company Executives And Employees [Member]              
Vesting period 3 years            
Fair value $ 7,259,000            
Restricted Stock Units granted 2,349,350            
Market price of common stock $ 3.09            
2009 Equity Incentive Plan [Member] | RSU [Member] | Employee [Member]              
Fair value $ 114,000            
Restricted Stock Units granted 36,985            
Market price of common stock $ 3.09