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Unaudited Condensed Statements of Comprehensive Income (Loss) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ (3,190,347) $ (70,121) $ (4,296,138) $ 314,970
Unrealized gain on available-for-sale securities, net of deferred taxes 11,125   6,987  
Total comprehensive income (loss) $ (3,179,222) $ (70,121) $ (4,289,151) $ 314,970