Quarterly report pursuant to Section 13 or 15(d)

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) attributable to common stockholders $ 544,901 $ 1,281,290 $ (1,994,461) $ (1,015,950)
Other comprehensive (loss) income:        
Unrealized gain on forward contract 53,904   53,904  
Currency translation adjustment (122,220)   (120,286)  
Total other comprehensive (loss) income (68,316)   (66,382)  
Comprehensive income (loss) $ 476,585 $ 1,281,290 $ (2,060,843) $ (1,015,950)