FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets Measured or Disclosed at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Long-term liability:
Embedded debt derivative	$ 760	$ 760
Fair value measurements recurring
Cash equivalents:
Money market funds	6,069	52,442
Long-term liability:
Embedded debt derivative	760	760
Fair value measurements recurring | Level 1
Cash equivalents:
Money market funds	6,069	52,442
Long-term liability:
Embedded debt derivative	0	0
Fair value measurements recurring | Level 2
Cash equivalents:
Money market funds	0	0
Long-term liability:
Embedded debt derivative	0	0
Fair value measurements recurring | Level 3
Cash equivalents:
Money market funds	0	0
Long-term liability:
Embedded debt derivative	$ 760	$ 760