STOCKHOLDERS' EQUITY - Common Stock Shares (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021 Vote $ / shares shares	Dec. 31, 2020 Vote $ / shares shares
Class A common stock
Class of Stock [Line Items]
Common shares, shares authorized (in shares)	100,000,000	100,000,000
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common shares, votes per share | Vote	1	1
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders	20.00%	20.00%
Class B common stock
Class of Stock [Line Items]
Common shares, shares authorized (in shares)	10,000,000	10,000,000
Common shares, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common shares, votes per share | Vote	1	1
Common shares, shares issued (in shares)	5,010,000	5,010,000
Common shares, shares outstanding (in shares)	5,010,000	5,010,000