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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
2015
 
2014
 
2013
Beginning balance
$
2,723

 
$
1,705

 
$
929

Additions to sales allowance and bad debt expense
1,342

 
1,610

 
1,305

Deductions (write-offs/recoveries) from reserve
(531
)
 
(592
)
 
(529
)
Ending balance
$
3,534

 
$
2,723

 
$
1,705
Summary of product warranty activity
The following table summarizes product warranty activity during 2015 and 2014:

 
2015
 
2014
Beginning balance
$
1,853

 
$
1,269

Charges to expense
1,431

 
2,048

Costs incurred
(1,404
)
 
(1,464
)
Ending balance
$
1,880

 
$
1,853
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,
 
2015
 
2014
 
2013
Customer-funded service sales
$
3,002

 
$
3,806

 
$
10,302

Customer-funded costs included in costs of service sales
1,546

 
2,633

 
2,387
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:
 
2015
 
2014
 
2013
Weighted average common shares outstanding—basic
15,625

 
15,420

 
15,144

Dilutive common shares issuable in connection with stock plans
209

 
185

 
197

Weighted average common shares outstanding—diluted
15,834

 
15,605

 
15,341