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Stock Options Excluded from Calculation of Diluted Net Loss Per Share (Details Narrative) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income (loss) per share:        
Stock Options Excluded from Calculation of Diluted Net Income (Loss) Per Share 2,185,351 2,359,034 2,223,476 2,359,034