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Unaudited Condensed Statement of Comprehensive Income (Loss) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net income (loss) $ (1,105,791) $ 385,090
Unrealized loss on available-for-sale securities (4,136)  
Total comprehensive income (loss) $ (1,109,927) $ 385,090