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Balance Sheet Details | 6 Months Ended
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Dec. 31, 2014
Balance Sheet Details |
Balance Sheet Details | 2. Balance Sheet Details The following tables provide details of selected balance sheet accounts (in thousands):
|  | June 30, 2014 |  | December 31, 2014 |
Accounts receivabl e |  |  |  |  |
Billed receivables |  | $ | 189,489 |  | $ | 188,351 |
Unbilled receivables |  | 1,975 |  | 2,727 |
Less allowance for doubtful accounts |  | (5,691 | ) | (6,850 | )
Total |  | $ | 185,773 |  | $ | 184,228 |
|  | June 30, 2014 |  | December 31, 2014 |
Inventories |  |  |  |  |
Raw materials |  | $ | 117,945 |  | $ | 154,948 |
Work-in-process |  | 33,394 |  | 52,909 |
Finished goods |  | 82,799 |  | 56,044 |
Total |  | $ | 234,138 |  | $ | 263,901 |
|  | June 30, 2014 |  | December 31, 2014 |
Property and equipment |  |  |  |  |
Buildings and improvements |  | $ | 163,952 |  | $ | 166,453 |
Leasehold improvements |  | 9,744 |  | 10,318 |
Equipment and tooling |  | 154,367 |  | 155,642 |
Furniture and fixtures |  | 4,017 |  | 4,093 |
Computer equipment |  | 17,466 |  | 18,276 |
Computer software |  | 15,670 |  | 16,185 |
|  | 365,216 |  | 370,967 |
Less: accumulated depreciation and amortization |  | (131,038 | ) | (155,344 | )
|  | 234,178 |  | 215,623 |
Land |  | 13,651 |  | 13,651 |
Construction in process |  | 12,650 |  | 11,095 |
Property and equipment, net |  | $ | 260,479 |  | $ | 240,369 |
Depreciation expense was approximately $12.3 million and $13.3 million for the three months ended December 31, 2013 and 2014, respectively, and approximately $23.8 million and $30.2 million for the six months ended December 31, 2013 and 2014, respectively.

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