SIGNIFICANT ACCOUNTING POLICIES - Convertible notes (Details) $ in Thousands	Dec. 31, 2023 USD ($)
SIGNIFICANT ACCOUNTING POLICIES
Convertible notes	$ 20,251
Additional paid in capital	415,045
Accumulated deficit	381,549
ASU 2020-06 | Cumulative Effect, Period of Adoption, Adjusted Balance
SIGNIFICANT ACCOUNTING POLICIES
Convertible notes	20,420
Additional paid in capital	414,652
Accumulated deficit	381,325
ASU 2020-06 | Effect of Change
SIGNIFICANT ACCOUNTING POLICIES
Convertible notes	169
Additional paid in capital	(393)
Accumulated deficit	$ 224