EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss attributable to all stockholders	$ (1,141)	$ (5,520)	$ (334)	$ (3,948)	$ 808	$ 2,288	$ (6,995)	$ (852)
Class A
Numerator:
Common stock as a percentage of total shares outstanding, basic	32.37%			27.09%			29.91%	22.91%
Net loss attributable to stockholders, basic	$ (369)			$ (1,070)			$ (2,092)	$ (195)
Common stock as a percentage of total shares outstanding, diluted	32.37%			27.09%			29.91%	22.91%
Net loss attributable to stockholders, diluted	$ (369)			$ (1,070)			$ (2,092)	$ (195)
Denominator:
Weighted average common stock, basic (in shares)	48,488			40,141			44,708	33,775
Weighted average common stock, diluted (in shares)	48,488			40,141			44,708	33,775
Net loss per share, basic (in dollars per share)	$ (0.01)			$ (0.03)			$ (0.05)	$ (0.01)
Net loss per share, diluted (in dollars per share)	$ (0.01)			$ (0.03)			$ (0.05)	$ (0.01)
Class A | Amended Options
Denominator:
Anti-dilutive shares	8,113			9,674			8,343	10,493
Class A | Out-of-the-money options
Denominator:
Anti-dilutive shares	760			354			764	229
Class A | Restricted Stock Awards
Denominator:
Anti-dilutive shares	273			390			301	542
Class A | Restricted Stock Units
Denominator:
Anti-dilutive shares	2,485			436			2,153	354
Class A | ESPP
Denominator:
Anti-dilutive shares	53			28			48	27
Class B
Numerator:
Common stock as a percentage of total shares outstanding, basic	67.63%			72.91%			70.09%	77.09%
Net loss attributable to stockholders, basic	$ (772)			$ (2,878)			$ (4,903)	$ (657)
Common stock as a percentage of total shares outstanding, diluted	67.63%			72.91%			70.09%	77.09%
Net loss attributable to stockholders, diluted	$ (772)			$ (2,878)			$ (4,903)	$ (657)
Denominator:
Weighted average common stock, basic (in shares)	101,307			108,017			104,772	113,646
Weighted average common stock, diluted (in shares)	101,307			108,017			104,772	113,646
Net loss per share, basic (in dollars per share)	$ (0.01)			$ (0.03)			$ (0.05)	$ (0.01)
Net loss per share, diluted (in dollars per share)	$ (0.01)			$ (0.03)			$ (0.05)	$ (0.01)