LEASES - Narrative (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2022 USD ($) ft²	Mar. 31, 2021 USD ($)	Jan. 31, 2020 ft²	Nov. 12, 2014 ft²
Lessee, Lease, Description [Line Items]
Operating lease liabilities		$ 3,059		$ 1,648	$ 3,059
Operating lease, borrowing rate		3.50%			3.50%
Right-of-use assets		$ 1,607		912	$ 1,607
Impairment of right-of-use lease asset				32	$ 271
Sublease, initial direct costs				300
Prepaid Expenses and Other Current Assets
Lessee, Lease, Description [Line Items]
Sublease, initial direct costs				100
Other Assets
Lessee, Lease, Description [Line Items]
Sublease, initial direct costs				$ 100
San Francisco California Facility
Lessee, Lease, Description [Line Items]
Area | ft²								5,000
Operating lease liabilities							$ 600
Operating lease, borrowing rate							3.50%
Right-of-use assets							$ 600
Impairment of right-of-use lease asset	$ 32	$ 300
San Jose California Facility
Lessee, Lease, Description [Line Items]
Area | ft²									42,000
Impairment of right-of-use lease asset			$ 900
Aventura Florida Facility | Subsequent Event
Lessee, Lease, Description [Line Items]
Area | ft²						1,390
Operating lease liabilities						$ 100