FAIR VALUE MEASUREMENTS - Valuation of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Warrants issued to Foxconn
FAIR VALUE MEASUREMENTS
Derivative Liability	$ 300
Fair Value, Inputs, Level 3 | Private warrants to purchase common stock
FAIR VALUE MEASUREMENTS
Derivative Liability	254	$ 485
Fair Value, Inputs, Level 3 | Warrants issued to Foxconn
FAIR VALUE MEASUREMENTS
Derivative Liability	170
Fair Value, Recurring
FAIR VALUE MEASUREMENTS
Cash and Cash Equivalents	121,358	244,016
Short-term investments with a fair value	100,297
Fair Value, Recurring | Private warrants to purchase common stock
FAIR VALUE MEASUREMENTS
Derivative Liability	254	485
Fair Value, Recurring | Warrants issued to Foxconn
FAIR VALUE MEASUREMENTS
Derivative Liability	170
Fair Value, Recurring | Fair Value, Inputs, Level 1
FAIR VALUE MEASUREMENTS
Cash and Cash Equivalents	121,358	244,016
Fair Value, Recurring | Fair Value, Inputs, Level 2
FAIR VALUE MEASUREMENTS
Short-term investments with a fair value	100,297
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Private warrants to purchase common stock
FAIR VALUE MEASUREMENTS
Derivative Liability	254	$ 485
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Warrants issued to Foxconn
FAIR VALUE MEASUREMENTS
Derivative Liability	$ 170