DEBT (Tables)

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Schedule of Long-term Debt

The components of the long-term debt balance are as follows:

	March 31, 2022			December 31, 2021
Notes payable, gross	$	7,222		$	8,055
Less: Unamortized debt discount and    issuance costs		(76	)		(93	)
Accretion of final payment fee		369			339
Carrying value of notes payable		7,515			8,301
Less: Current portion of long-term debt		(3,298	)		(3,295	)
Long-term debt, net of issuance costs and    discount	$	4,217		$	5,006

Schedule of Estimated Future Principal Payments

As of March 31, 2022, the estimated future principal payments due were as follows:

	As of March 31, 2022
2022	$	2,500
2023		3,333
2024		1,389
Thereafter		—
Total principal payments	$	7,222