REDEEMABLE CONVERTIBLE PREFERRED STOCK - Issued and Outstanding Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Jun. 30, 2021	May 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)	0		7,752,515	7,752,515	7,752,515
Redeemable convertible preferred stock	$ 0		$ 59,987	$ 59,987	$ 59,987
Convertible preferred stock, shares issued (in shares)	0		7,752,515
Series Seed
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)		2,057,188	2,057,188
Redeemable convertible preferred stock		$ 1,897	$ 1,897
Convertible preferred stock, shares issued (in shares)		2,057,188	2,057,188
Series A
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)		2,110,400	2,110,400
Redeemable convertible preferred stock		$ 4,948	$ 4,948
Convertible preferred stock, shares issued (in shares)		2,110,400	2,110,400
Series B
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)		990,068	990,068
Redeemable convertible preferred stock		$ 10,285	$ 10,285
Convertible preferred stock, shares issued (in shares)		990,068	990,068
Series C
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)		2,142,188	2,142,188
Redeemable convertible preferred stock		$ 34,585	$ 34,585
Convertible preferred stock, shares issued (in shares)		2,142,188	2,142,188
Series C-1
Preferred Units [Line Items]
Convertible preferred stock, shares outstanding (in shares)		452,671	452,671
Redeemable convertible preferred stock		$ 8,272	$ 8,272
Convertible preferred stock, shares issued (in shares)		452,671	452,671