RESTATEMENT AND REVISION OF PREVIOUSLY REPORTED CONSOLIDATED FINANCIAL STATEMENTS - CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ 7,124	$ (4,790)	$ 16,059	$ 11,269	$ 18,393	$ 17,043	$ (12,214)
Depreciation of premises and equipment			56	103	147	193	310
Amortization of developed software			2,823	5,645	8,467	11,444	11,047
Amortization of other intangible assets			80	160	240	321	664
Amortization of leased assets			282	368	644	820	1,253
Impairment of software assets			0	0	0	215	3,721
Share-based compensation expense			3,139	5,536	8,019	11,343	468
Gain on fair value of private warrant liability	(6,042)	3,056	(15,003)	(11,947)	(17,989)	(17,225)	0
Accounts receivable, net			(1,241)	(1,525)	197	872	1,306
Prepaid expenses and other current assets			(2,683)	562	302	569	6,456
Receivable from Partner Bank			0	0	0		0
Other assets			(372)	(354)	(631)	(804)	372
Payable to Partner Bank			0	0	0		0
Accounts payable and accrued liabilities			2,047	5,474	(115)	(1,228)	(3,572)
Taxes payable			1,679	1,636	1,103	1,807	0
Operating lease liabilities			(182)	(357)	(535)	(715)	(1,406)
Deferred revenue			2,835	4,336	3,840	2,888	10,751
Other liabilities			0	0	0	0	(3,118)
Net Cash Provided by Operating Activities			9,519	20,906	22,082	27,543	16,038
Purchase or development of internal use software			(117)	(143)	(501)	(595)	(3,947)
Purchases of premises and equipment			0	(51)	(51)	(138)	(73)
Net Cash Used in Investing Activities			(117)	(194)	(552)	(733)	(4,020)
Repayments of borrowings from Partner Bank			(15,572)	(21,000)	(21,000)	(21,000)	(19,000)
Capital contribution from Partner Bank			0	0	0	0	1,385
Proceeds from Recapitalization transaction			20,560	16,888	16,888	16,888	0
Proceeds from exercise of warrants			0	0	0	17	0
Net Cash Used in Financing Activities			4,988	(4,112)	(4,112)	(4,095)	(17,615)
Net Increase (Decrease) in Cash and Cash Equivalents			14,390	16,600	17,418	22,715	(5,597)
Cash and cash equivalents	20,407	19,589	17,379	19,589	20,407	25,704	2,989	$ 8,586
Income taxes paid, net of refunds			0	1,424	3,124	4,224	0
Interest paid			119	178	178	178	0
Shares issued to settle Megalith accounts payable in connection with Recapitalization transaction			(740)	(740)	(740)	(740)	0
Share-based compensation expense recorded as capital contribution from Partner Bank			0	0	0	$ 0	468
As Previously Reported (Unaudited)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	8,794	(1,836)	18,889	17,053	25,847		(11,793)
Depreciation of premises and equipment			56	103	147		310
Amortization of developed software			2,823	5,645	8,467		11,047
Amortization of other intangible assets			80	160	240		664
Amortization of leased assets			282	368	644		1,253
Impairment of software assets			0	0	0		3,721
Share-based compensation expense			5	13	87		468
Gain on fair value of private warrant liability	(6,042)	3,056	(15,003)	(11,947)	(17,989)		0
Accounts receivable, net			1,768	(873)	2,886		3,106
Prepaid expenses and other current assets			(2,683)	562	302		6,456
Receivable from Partner Bank			0	0	0		849
Other assets			(372)	(354)	(631)		372
Payable to Partner Bank			0	2,012	1,809		5,105
Accounts payable and accrued liabilities			3,923	5,618	105		(3,747)
Taxes payable			0	1,317	863		0
Operating lease liabilities			(182)	(357)	(535)		(1,406)
Deferred revenue			(67)	1,586	(160)		2,751
Other liabilities			0	0	0		(3,118)
Net Cash Provided by Operating Activities			9,519	20,906	22,082		16,038
Purchase or development of internal use software			(117)	(143)	(501)		(3,947)
Purchases of premises and equipment			0	(51)	(51)		(73)
Net Cash Used in Investing Activities			(117)	(194)	(552)		(4,020)
Repayments of borrowings from Partner Bank			(15,572)	(21,000)	(21,000)		(19,000)
Capital contribution from Partner Bank			0	0	0		1,385
Proceeds from Recapitalization transaction			20,560	16,888	16,888		0
Proceeds from exercise of warrants			0	0	0		0
Net Cash Used in Financing Activities			4,988	(4,112)	(4,112)		(17,615)
Net Increase (Decrease) in Cash and Cash Equivalents			14,390	16,600	17,418		(5,597)
Cash and cash equivalents	20,407	19,589	17,379	19,589	20,407		2,989	8,586
Income taxes paid, net of refunds			0	1,424	3,124		0
Interest paid			119	178	178		0
Shares issued to settle Megalith accounts payable in connection with Recapitalization transaction			0	0	0
Share-based compensation expense recorded as capital contribution from Partner Bank			0	0	0		468
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	(1,670)	(2,954)	(2,830)	(5,784)	(7,454)		(421)
Depreciation of premises and equipment			0	0	0		0
Amortization of developed software			0	0	0		0
Amortization of other intangible assets			0	0	0		0
Amortization of leased assets			0	0	0		0
Impairment of software assets			0	0	0		0
Share-based compensation expense			3,134	5,523	7,932		0
Gain on fair value of private warrant liability	0	0	0	0	0		0
Accounts receivable, net			(3,009)	(652)	(2,689)		(1,800)
Prepaid expenses and other current assets			0	0	0		0
Receivable from Partner Bank			0	0	0		(849)
Other assets			0	0	0		0
Payable to Partner Bank			0	(2,012)	(1,809)		(5,105)
Accounts payable and accrued liabilities			(1,876)	(144)	(220)		175
Taxes payable			1,679	319	240		0
Operating lease liabilities			0	0	0		0
Deferred revenue			2,902	2,750	4,000		8,000
Other liabilities			0	0	0		0
Net Cash Provided by Operating Activities			0	0	0		0
Purchase or development of internal use software			0	0	0		0
Purchases of premises and equipment			0	0	0		0
Net Cash Used in Investing Activities			0	0	0		0
Repayments of borrowings from Partner Bank			0	0	0		0
Capital contribution from Partner Bank			0	0	0		0
Proceeds from Recapitalization transaction			0	0	0		0
Proceeds from exercise of warrants			0	0	0		0
Net Cash Used in Financing Activities			0	0	0		0
Net Increase (Decrease) in Cash and Cash Equivalents			0	0	0		0
Cash and cash equivalents	$ 0	$ 0	0	0	0		0	$ 0
Income taxes paid, net of refunds			0	0	0		0
Interest paid			0	0	0		0
Shares issued to settle Megalith accounts payable in connection with Recapitalization transaction			(740)	(740)	(740)
Share-based compensation expense recorded as capital contribution from Partner Bank			$ 0	$ 0	$ 0		$ 0