BALANCE SHEET COMPONENTS - Property and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
PROPERTY AND EQUIPMENT, NET:
Property and equipment, gross	$ 12,904		$ 12,904		$ 12,969
Less accumulated depreciation and amortization	(5,732)		(5,732)		(5,146)
Property and equipment - net	7,172		7,172		7,823
Depreciation expense	300	$ 300	600	$ 600
Furniture and fixtures
PROPERTY AND EQUIPMENT, NET:
Property and equipment, gross	$ 1,536		$ 1,536		$ 1,532
Depreciation/Amortization Period	7 years		7 years		7 years
Equipment and computers
PROPERTY AND EQUIPMENT, NET:
Property and equipment, gross	$ 5,064		$ 5,064		$ 5,129
Equipment and computers | Minimum
PROPERTY AND EQUIPMENT, NET:
Depreciation/Amortization Period	3 years		3 years		3 years
Equipment and computers | Maximum
PROPERTY AND EQUIPMENT, NET:
Depreciation/Amortization Period	7 years		7 years		7 years
Leasehold improvements
PROPERTY AND EQUIPMENT, NET:
Property and equipment, gross	$ 6,304		$ 6,304		$ 6,308
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember		us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember		us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember