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Balance Sheet Details (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Building | Dec. 31, 2012 Building | Dec. 31, 2013 Computer software | Dec. 31, 2012 Computer software | Dec. 31, 2013 Computer equipment | Dec. 31, 2012 Computer equipment | Dec. 31, 2013 Furniture and fixtures | Dec. 31, 2012 Furniture and fixtures | Dec. 31, 2013 Leasehold improvements | Dec. 31, 2012 Leasehold improvements | Dec. 31, 2013 Machinery | Dec. 31, 2012 Machinery | Dec. 31, 2013 Construction in progress | Dec. 31, 2012 Construction in progress | Dec. 31, 2013 LDT Building Improvements | Sep. 30, 2012 LDT Building Improvements | Dec. 31, 2013 LDT Machinery | Dec. 31, 2013 LDT Software | Sep. 30, 2012 LDT Software | Dec. 31, 2013 Facility Closing [Member] | Jan. 31, 2013 MTSPELLC Amended [Member] sqft | Nov. 04, 2011 MTSPELLC Amended [Member] sqft
Property, plant and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, gross | $ 123,456,000 |  |  | $ 153,348,000 |  | $ 123,456,000 | $ 153,348,000 |  | $ 40,320,000 | $ 42,129,000 | $ 22,068,000 | $ 36,349,000 | $ 29,869,000 | $ 29,371,000 | $ 12,360,000 | $ 12,708,000 | $ 7,024,000 | $ 9,731,000 | $ 11,533,000 | $ 13,501,000 | $ 282,000 | $ 9,559,000 |  |  |  |  |  |  |  |
Less accumulated depreciation and amortization | (50,814,000) |  |  | (66,443,000) |  | (50,814,000) | (66,443,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 72,642,000 |  |  | 86,905,000 |  | 72,642,000 | 86,905,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 | 5,800,000 | 500,000 | 200,000 | 600,000 |  |  |
Total space under lease (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000 | 31,000
Restructuring costs | 2,200,000 | 1,100,000 | 2,200,000 | 700,000 | 6,600,000 | 5,546,000 | 7,301,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Construction costs capitalized |  |  |  | 6,700,000 |  |  | 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction in progress, capitalized | 40,300,000 |  |  | 48,800,000 |  | 40,300,000 | 48,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  | $ 15,451,000 | $ 13,190,000 | $ 11,894,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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