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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended
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Mar. 31, 2013
Accounting Policies [Abstract] |
Allowance for doubtful accounts rollforward | The following is a summary of activity for the allowance for doubtful accounts during the three months ended March 31, 2013 and 2012:
| Dollars in Thousands
| Beginning Balance |  | Provision |  | Write Offs |  | Ending Balance
Three Months Ended March 31, 2013 | $ | 2,171 |  |  | $ | 1,581 |  |  | $ | (1,203 | ) |  | $ | 2,549 |
Three Months Ended March 31, 2012 | $ | 1,088 |  |  | $ | 474 |  |  | $ | (483 | ) |  | $ | 1,079 |
Allowance for obsolete inventory rollforward | The following is a summary of activity for the allowance for obsolete inventory during the three months ended March 31, 2013 and 2012:
| Dollars in Thousands
| Beginning Balance |  | Provision |  | Write Offs |  | Ending Balance
Three Months Ended March 31, 2013 | $ | 616 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 611 |
Three Months Ended March 31, 2012 | $ | 511 |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 509 |
Schedule of property and equipment, useful lives | Depreciation is computed by the straight-line method over the estimated useful lives of the related assets as follows:
Leasehold improvements | 1 to 10 years
Furniture and fixtures | 3 to 7 years
Production equipment | 3 to 7 years
Computer equipment | 3 to 7 years
Research and development equipment | 2 to 7 years

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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