FAIR VALUE MEASUREMENTS - Valuation of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
FAIR VALUE MEASUREMENTS
Short-term investments with a fair value	$ 49,300
Foxconn Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	300
Fair Value, Inputs, Level 3 | Private Placement Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	731	$ 485
Fair Value, Inputs, Level 3 | Foxconn Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	561
Fair Value, Recurring
FAIR VALUE MEASUREMENTS
Cash and Cash Equivalents	154,232	244,016
Short-term investments with a fair value	49,304
Fair Value, Recurring | Private Placement Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	731	485
Fair Value, Recurring | Foxconn Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	561
Fair Value, Recurring | Fair Value, Inputs, Level 1
FAIR VALUE MEASUREMENTS
Cash and Cash Equivalents	154,232	244,016
Fair Value, Recurring | Fair Value, Inputs, Level 2
FAIR VALUE MEASUREMENTS
Short-term investments with a fair value	49,304
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Private Placement Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	731	$ 485
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Foxconn Warrants
FAIR VALUE MEASUREMENTS
Derivative Liability	$ 561