STOCK-BASED COMPENSATION, Share Option Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
	May 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Employee Share Option
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		9,211,641
Granted (in shares)		24,000
Exercised (in shares)		(140,775)
Forfeited/cancelled (in shares)		(24,219)
Outstanding, end of period (in shares)		9,070,647		9,211,641
Vested and exercisable (in shares)		6,635,252
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 3.58
Granted (in dollars per share)		6.54
Exercised (in dollars per share)		1.64
Forfeited/cancelled (in dollars per share)		11.88
Outstanding at end of period (in dollars per share)		3.64		$ 3.58
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		8.24
Granted (in dollars per share)		11.85
Exercised (in dollars per share)		4.00
Forfeited/cancelled (in dollars per share)		24.45
Outstanding, end of period (in dollars per share)		$ 8.11		$ 8.24
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		5 years 7 months 2 days		6 years 4 months 9 days
Unrecognized employee stock-based compensation expense		$ 11,927		$ 16,009
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition		1 year 2 months 8 days		1 year 6 months 10 days
Employee Share Option | ACM Shanghai
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		5,377,500
Exercised (in shares)	(2,150,309)	(2,150,309)
Forfeited/cancelled (in shares)		(92,308)
Outstanding, end of period (in shares)		3,134,883		5,377,500
Vested and exercisable (in shares)		492,308
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 0.23
Exercised (in dollars per share)		0.20
Forfeited/cancelled (in dollars per share)		0.23
Outstanding at end of period (in dollars per share)		0.23		$ 0.23
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		1.93
Exercised (in dollars per share)		1.88
Forfeited/cancelled (in dollars per share)		1.88
Outstanding, end of period (in dollars per share)		$ 1.90		$ 1.93
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		1 year 4 months 6 days		1 year 9 months 3 days
Non-Employee Stock Option
Number of Option Share [Roll Forward]
Outstanding, beginning of period (in shares)		1,483,658
Exercised (in shares)		(155,429)
Forfeited/cancelled (in shares)		(8,103)
Outstanding, end of period (in shares)		1,320,126		1,483,658
Vested and exercisable (in shares)		1,308,876
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)		$ 0.38
Exercised (in dollars per share)		0.24
Forfeited/cancelled (in dollars per share)		0.22
Outstanding at end of period (in dollars per share)		0.40		$ 0.38
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)		1.15
Exercised (in dollars per share)		0.57
Forfeited/cancelled (in dollars per share)		0.50
Outstanding, end of period (in dollars per share)		$ 1.22		$ 1.15
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term		3 years 14 days		3 years 8 months 4 days
Unrecognized employee stock-based compensation expense		$ 32		$ 55
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition		10 days		21 days
Non-Employee Stock Option | ACM Shanghai
Weighted Average Remaining Contractual Term
Unrecognized employee stock-based compensation expense		$ 76		$ 160
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition		4 months 24 days	9 months 18 days