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Balance Sheet Details (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Accounts Receivable |  |  |  |  |  |
Accounts receivable |  | $ 219,462 |  | $ 219,462 |  | $ 216,089
Less allowance for doubtful accounts |  | (11,008) |  | (11,008) |  | (9,563)
Total |  | 208,454 |  | 208,454 |  | 206,526
Inventories |  |  |  |  |  |
Raw materials |  | 140,275 |  | 140,275 |  | 129,645
Work-in-process |  | 77,922 |  | 77,922 |  | 65,454
Finished goods |  | 62,836 |  | 62,836 |  | 53,411
Total |  | 281,033 |  | 281,033 |  | 248,510
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 421,152 |  | 421,152 |  | 389,655
Less accumulated depreciation and amortization |  | (277,882) |  | (277,882) |  | (248,116)
Property and equipment, net |  | 143,270 |  | 143,270 |  | 141,539
Depreciation expense |  | 16,800 | $ 13,400 | 33,000 | $ 26,700 |
AS&E facility in Billerica, MA |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Purchase of property and equipment | $ 19,800 |  |  |  |  |
Land |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 17,129 |  | 17,129 |  | 14,212
Land | AS&E facility in Billerica, MA |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Purchase of property and equipment | 2,900 |  |  |  |  |
Buildings, civil works and improvements |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 179,643 |  | $ 179,643 |  | 157,123
Buildings, civil works and improvements | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 5 years |  |
Buildings, civil works and improvements | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 40 years |  |
Buildings, civil works and improvements | AS&E facility in Billerica, MA |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Purchase of property and equipment | $ 16,900 |  |  |  |  |
Leasehold improvements |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 9,308 |  | $ 9,308 |  | 9,025
Leasehold improvements | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 1 year |  |
Leasehold improvements | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 12 years |  |
Equipment and tooling |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 170,372 |  | $ 170,372 |  | 166,991
Equipment and tooling | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 3 years |  |
Equipment and tooling | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 10 years |  |
Furniture and fixtures |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 3,427 |  | $ 3,427 |  | 3,371
Furniture and fixtures | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 3 years |  |
Furniture and fixtures | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 13 years |  |
Computer equipment |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 19,054 |  | $ 19,054 |  | 17,991
Computer equipment | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 3 years |  |
Computer equipment | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 5 years |  |
Computer Software |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 17,844 |  | $ 17,844 |  | 17,303
Computer Software | Minimum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 3 years |  |
Computer Software | Maximum |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 10 years |  |
Computer software implementation in process |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | 3,676 |  | $ 3,676 |  | 2,590
Construction in process |  |  |  |  |  |
Property and Equipment |  |  |  |  |  |
Property and equipment, gross |  | $ 699 |  | $ 699 |  | $ 1,049

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