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Intangible Assets - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment loss | $ 22,800,000 |  |
Purchased intangible assets net |  | 2,467,000 | 2,915,000
Intangible assets accumulated amortization |  | 10,304,000 | 9,856,000
Acquired software licenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Purchased intangible assets net |  | 168,000 | 248,000
Intangible assets accumulated amortization |  | $ 2,200,000 | $ 2,100,000

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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