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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2013 and 2012:
 
 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Three Months Ended September 30, 2013
$
2,362

 
$
2,769

 
$
(1,086
)
 
$
4,045

Three Months Ended September 30, 2012
$
1,236

 
$
679

 
$
(339
)
 
$
1,576

Nine Months Ended September 30, 2013
$
2,171

 
$
4,966

 
$
(3,092
)
 
$
4,045

Nine Months Ended September 30, 2012
$
1,088

 
$
1,649

 
$
(1,161
)
 
$
1,576
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, 2013 and 2012: 

 
Dollars in Thousands
 
Beginning
Balance
 
Provision
 
Write Offs
 
Ending
Balance
Three Months Ended September 30, 2013
$
593

 
$
19

 
$
(3
)
 
$
609

Three Months Ended September 30, 2012
$
559

 
$
35

 
$
(13
)
 
$
581

Nine Months Ended September 30, 2013
$
616

 
$
19

 
$
(26
)
 
$
609

Nine Months Ended September 30, 2012
$
511

 
$
88

 
$
(18
)
 
$
581
Schedule of property and equipment, useful lives
Depreciation is computed using 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