SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of reconciliation of cash and restricted cash to amounts shown in the statements of cash flow

The following table provides a reconciliation of cash and restricted cash to amounts shown in the statements of cash flows (in thousands):

	December 31,
	2020		2019
Cash	$	614,412	$	351,684
Restricted cash, current portion		11,278		19,767
Restricted cash, less current portion		14,728		8,200
Total cash and restricted cash	$	640,418	$	379,651

Schedule of estimated useful lives

Asset Category	Life (years)
Machinery	5
Computer equipment and software	3
Furniture and fixtures	5
Capital leases	3
Leasehold improvements	Shorter of the lease term and the estimated useful lives of the assets

Schedule of inventory

	December 31,
	2020		2019
Raw materials	$	661	$	205
Work in progress		70		51
Finished goods		312		428
Total inventory	$	1,043	$	684