COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) $ in Millions	Sep. 30, 2021 USD ($) ft²	Mar. 03, 2021 ft²
Operating Leased Assets [Line Items]
Weighted-average remaining lease term (in years)	3 years 10 months 24 days
Weighted-average discount rate (as a percent)	7.60%
Purchase commitments | $	$ 4.9
Oakwood Village, Ohio | Lease Agreement
Operating Leased Assets [Line Items]
Area of land	19,800
Mountain View, California | Lease Agreement
Operating Leased Assets [Line Items]
Area of land	25,500
Additional area of land	24,600
Denver, Colorado | Sub-Lease Agreement
Operating Leased Assets [Line Items]
Area of land	19,800	12,800
Maximum | Mountain View, California | Lease Agreement
Operating Leased Assets [Line Items]
Lease agreement, renewal term (in years)	5 years