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Net income / (loss) per share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Numerator [Abstract]                    
Net loss $ (9,005,982) $ (11,279,724) $ (3,143,310) $ 2,905,674 $ (1,703,005) $ (748,816) $ (312,119) $ (357,102) $ (20,523,342) $ (3,121,042)
Denominator [Abstract]                    
Basic weighted average number of shares (in shares) 51,253,591 48,325,164 46,126,490 37,769,554 25,033,398 23,182,817 18,736,370 14,979,803 45,814,868 20,518,894
Diluted weighted average number of shares (in shares) 51,253,591 48,325,164 46,126,490 40,987,346 25,033,398 23,182,817 18,736,370 14,979,803 45,814,868 20,518,894
Net loss per share [Abstract]                    
Basic (in dollars per share) $ (0.18) $ (0.23) $ (0.07) $ 0.08 $ (0.07) $ (0.03) $ (0.02) $ (0.02) $ (0.45) $ (0.15)
Diluted (in dollars per share) $ (0.18) $ (0.23) $ (0.07) $ 0.07 $ (0.07) $ (0.03) $ (0.02) $ (0.02) $ (0.45) $ (0.15)