CERTAIN BALANCE SHEET COMPONENTS (Tables)

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventories

Inventories:	December 31,
(in thousands)	2021		2020
Raw materials	$	22,245	$	2,529
Work-in-process	3,993		1,689
Finished goods	37,545		22,777
Service-related spares	7,412		8,036
Total	$	71,195	$	35,031

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets:	December 31,
(in thousands)	2021		2020
Prepaid expenses	$	8,074	$	11,453
Contract assets (1)	8,101		9,800
Other current assets	13,797		16,879
Total	$	29,972	$	38,132

(1) Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration.

Schedule of Property and Equipment, Net

Property and equipment, net:	December 31,
(in thousands)	2021		2020
Machinery and equipment	$	78,461	$	72,731
Capitalized software	38,306		37,141
Leasehold improvements	40,658		38,718
Furniture and fixtures	2,820		2,913
Construction-in-progress	1,892		2,209
Property and equipment, gross	162,137		153,712
Less: accumulated depreciation and amortization	(119,416)		(110,571)
Total	$	42,721	$	43,141

Schedule of Other Current Liabilities

Other current liabilities:	December 31,
(in thousands)	2021		2020
Accrued employee compensation and related expenses	$	26,820	$	23,131
Other	26,824		27,202
Total	$	53,644	$	50,333