CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Outstanding Warrants (Details)	Sep. 30, 2021 $ / shares shares
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares) | shares	18,236
Exercise price (in dollars per share) | $ / shares	$ 11.21
Investor Warrants, Placement Agents, $8.43
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares) | shares	12,229
Exercise price (in dollars per share) | $ / shares	$ 8.43
Investor Warrants, Placement Agents, $16.86
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares) | shares	6,007
Exercise price (in dollars per share) | $ / shares	$ 16.86