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Certain Balance Sheet Components
 12 Months Ended
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]  
Certain Balance Sheet Components CERTAIN BALANCE SHEET COMPONENTS
Inventories:December 31,
(in thousands)20202019
Raw materials$2,529 $4,179 
Work-in-process1,689 1,633 
Finished goods22,777 14,080 
Service-related spares8,036 9,150 
Total$35,031 $29,042 
Prepaid expenses and other current assets:December 31,
(in thousands)20202019
Prepaid expenses$11,453 $3,050 
Contract assets (1)
9,800 13,969 
Other current assets16,879 23,743 
Total$38,132 $40,762 
(1) Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration.
Property and equipment, net:December 31,
(in thousands)20202019
Machinery and equipment$72,731 $75,229 
Capitalized software37,141 34,190 
Leasehold improvements*
38,718 15,170 
Furniture and fixtures2,913 6,036 
Construction-in-progress2,209 5,506 
Property and equipment, gross153,712 136,131 
Less: accumulated depreciation and amortization(110,571)(113,203)
Total$43,141 $22,928 

*During fiscal 2020, the Company completed construction of $23.9 million leasehold improvements for the new headquarters facility.
Other current liabilities:December 31,
(in thousands)20202019
Accrued employee compensation and related expenses$23,131 $19,454 
Other27,202 35,426 
Total$50,333 $54,880