Principal Business Activity and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) installment segment	Dec. 31, 2020 USD ($)	Mar. 10, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Typical number of installments under the consumer installment payment plans | installment	4
Interest-free period	42 days
Typical settlement period from initiation of transaction with third parties	3 days
Cash and cash equivalents	$ 76,983,728	$ 84,285,383
Percentage of highest funded facility in previous two collection periods (percent)	1.00%
Minimum deposit balance required to be maintained	$ 25,000
Restricted cash, current	1,886,440	4,798,520
Restricted cash, non-current	$ 20,000	20,000
Installment period	14 days
Deferred income	$ 5,240,919	3,458,222
Total income	$ 114,816,635	58,788,273
Reactivation fee waiver period	2 days
Capitalization threshold	$ 1,000
Research and development in process	1,462,000	490,000
Impairment losses	5,475	7,850
Advertising costs	$ 8,569,276	3,883,936
Number of reportable segments | segment	1
Gains (losses) from foreign exchange rate fluctuations	$ (69,228)	(125,292)
Foreign currency translation adjustment	69,406	494,505
Subsequent Event
Disaggregation of Revenue [Line Items]
Expected cost savings			$ 10,000,000
Money Market Securities | Level 1
Disaggregation of Revenue [Line Items]
Money market securities	6,408,389	9,996,155
Sezzle income
Disaggregation of Revenue [Line Items]
Total income	98,200,184	49,659,042
Account reactivation fee income
Disaggregation of Revenue [Line Items]
Total income	$ 16,616,451	$ 9,129,231