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Current Liabilities (Tables)
 6 Months Ended
Jun. 29, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]  
Deferred Revenue, by Arrangement, Disclosure
Changes in our deferred service revenue for the three and six month periods ended June 29, 2013 and June 30, 2012 were as follows:
 
 
Three Months Ended
 
Six Months Ended
(In thousands)
June 29,
2013
 
June 30,
2012
 
June 29,
2013
 
June 30,
2012
Balance, beginning of the period
$
6,890

 
$
5,725

 
$
6,062

 
$
4,991

Additions
1,972

 
1,283

 
4,276

 
3,066

Revenue recognized
(1,464
)
 
(1,406
)
 
(2,940
)
 
(2,455
)
Balance, end of the period
$
7,398

 
$
5,602

 
$
7,398

 
$
5,602

Balance sheet classification
 
 
 
 
 
 
 
Deferred service income-short term
$
5,583

 
$
3,973

 
 
 
 
Deferred service income-long term
1,815

 
1,629

 
 
 
 
Balance, end of period
$
7,398

 
$
5,602

 
 
 
 
Schedule of Accrued Liabilities
Other current liabilities consisted of the following at June 29, 2013 and December 31, 2012:
 
(In thousands)
June 29,
2013
 
December 31,
2012
Salaries and benefits
$
8,122

 
$
10,359

Warranty accrual
1,873

 
2,273

Advanced billing
232

 
29

Accrued taxes-other
202

 
—

Capital lease, current portion
—

 
15

Other
1,533

 
2,184

Balance, end of the period
$
11,962

 
$
14,860
Schedule of Product Warranty Liability
Changes in our warranty accrual for the three and six month periods ended June 29, 2013 and June 30, 2012 were as follows:
 
 
Three Months Ended
 
Six Months Ended
(In thousands)
June 29,
2013
 
June 30,
2012
 
June 29,
2013
 
June 30,
2012
Balance, beginning of the period
$
2,052

 
$
2,165

 
$
2,273

 
$
2,398

Liabilities accrued for warranties issued
463

 
1,417

 
980

 
2,067

Warranty claims paid and utilized
(663
)
 
(825
)
 
(1,327
)
 
(1,282
)
Changes in accrued warranty liabilities
21

 
38

 
(53
)
 
(388
)
Balance, end of the period
$
1,873

 
$
2,795

 
$
1,873

 
$
2,795