INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 174,203	$ 66,123
Federal and state credits	35,414	17,335
Accruals and reserves	80,237	7,254
Stock based compensation	24,545	21,862
Deferred revenue	2,430	0
Inventory	572	1,345
Other	2,441	2,138
Total deferred tax assets	319,842	116,057
Deferred tax liabilities:
Depreciation and amortization	(131,964)	13,473
Discount on convertible senior notes	(15,521)	(20,851)
Total deferred tax liabilities	(147,485)	(7,378)
Deferred tax assets, net of deferred tax liabilities	172,357	108,679
Less: valuation allowance	(18,993)	(2,515)
Net deferred tax assets	$ 153,364	$ 106,164