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Accrued Liabilities
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accrued Liabilities ACCRUED LIABILITIES
Accrued liabilities consist of the following:
 
 
As of December 31,
 
 
2018
 
2017
Accrued compensation and benefits
 
$
17,745

 
$
16,144

Accrued warranties
 
2,571

 
2,628

Professional and legal fees
 
2,154

 
1,541

Taxes other than income
 
3,550

 
3,787

General services administration contract contingent liability (see Note 13)
 
5,267

 
—

Other accrued liabilities
 
5,040

 
3,262

 
 
$
36,327

 
$
27,362


Activity related to accrued warranties was as follows:
 
 
Years ended December 31,
 
 
2018
 
2017
 
2016
Balance, beginning of year
 
$
2,628

 
$
2,594

 
$
2,309

Provision for warranty expense
 
4,096

 
4,045

 
3,544

Fulfillment of warranty obligations
 
(4,153
)
 
(4,011
)
 
(3,259
)
Balance, end of year
 
$
2,571

 
$
2,628

 
$
2,594