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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) | 12 Months Ended
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Dec. 31, 2012
Leasehold improvements | Shorter of the useful lives or the lease term
Software Copyrights [Member] |
Intangible Asset Useful Life (in years) | 20 years
Other Software [Member] |
Intangible Asset Useful Life (in years) | 5 years

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- Definition Useful life of long lived, intangible assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
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Namespace Prefix: | dhrm_
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Period Type: | duration

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- Definition A description of the finite or indefinite-lived intangible asset (excluding goodwill) that is impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275 + Details
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Namespace Prefix: | us-gaap_
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