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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2012
Accounting Policies [Abstract]  
Allowance for doubtful accounts rollforward
The following is a summary of activity for the allowance for doubtful accounts during the three and nine months ended September 30, 2012 and 2011:
 
 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Three Months Ended September 30, 2012
$
1,236

 
$
679

 
$
(339
)
 
$
1,576

Three Months Ended September 30, 2011
$
1,387

 
$
205

 
$
(113
)
 
$
1,479

Nine Months Ended September 30, 2012
$
1,088

 
$
1,649

 
$
(1,161
)
 
$
1,576

Nine Months Ended September 30, 2011
$
334

 
$
1,432

 
$
(287
)
 
$
1,479
Allowance for obsolete inventory rollforward
The following is a summary of activity for the allowance for obsolete inventory during the three and nine months ended September 30, 2012 and 2011: 

 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Three Months Ended September 30, 2012
$
559

 
$
35

 
$
(13
)
 
$
581

Three Months Ended September 30, 2011
$
520

 
$
(2
)
 
$
(4
)
 
$
514

Nine Months Ended September 30, 2012
$
511

 
$
88

 
$
(18
)
 
$
581

Nine Months Ended September 30, 2011
$
518

 
$
47

 
$
(51
)
 
$
514
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