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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Schedule of accounts, notes, loans and financing receivable
Activity within the Company’s allowance for doubtful accounts for the periods presented is as follows:
 
2012
 
2011
 
2010
Beginning balance
$
623

 
$
592

 
$
844

Additions charged to expense
536

 
276

 
281

Deductions (write-offs/recoveries) from reserve
(230
)
 
(245
)
 
(533
)
Ending balance
$
929

 
$
623

 
$
592
Summary of product warranty activity
The following table summarizes product warranty activity during 2012 and 2011:
 
2012
 
2011
Beginning balance
$
933

 
$
887

Charges to expense
419

 
772

Costs incurred
(538
)
 
(726
)
Ending balance
$
814

 
$
933
Revenue and related development costs, customer-funded research and development costs
Revenue and related development costs from customer-funded research and development are as follows:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Customer-funded product sales
$
—

 
$
—

 
$
4,478

Customer-funded service sales
5,470

 
1,061

 
1,062

Customer-funded costs included in costs of service sales
3,424

 
412

 
953

Customer-funded costs included in costs of product sales
—

 
—

 
1,001
Schedule of reconciliation of basic and diluted weighted average common shares outstanding
A reconciliation of the basic and diluted weighted average common shares outstanding is as follows:
 
2012
 
2011
 
2010
Weighted average common shares outstanding—basic
14,777,175

 
14,767,606

 
14,419,599

Dilutive common shares issuable in connection with stock plans
241,776

 
304,736

 
430,726

Weighted average common shares outstanding—diluted
15,018,951

 
15,072,342

 
14,850,325