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Schedule II- Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS 
Description
Balance at
Beginning
of Period
 
Charged to
Costs and
Expenses
 
Charged to
Other
Accounts
 
Deductions
 
Balance at
End of
Period
Allowance for doubtful accounts:
 
 
 
 
 
 
 
 
 
Year ended December 31, 2017
$
443

 
$
592

 
$
—

 
$
(306
)
 
$
729

Year ended December 31, 2016
322

 
205

 
—

 
(84
)
 
443

Year ended December 31, 2015
251

 
86

 
—

 
(15
)
 
322

Warranty reserve:
 
 
 
 
 
 
 
 
 
Year ended December 31, 2017
$
780

 
$
109

 
$
—

 
$
(245
)
 
$
644

Year ended December 31, 2016
314

 
621

 
—

 
(155
)
 
780

Year ended December 31, 2015
675

 
(62
)
 
—

 
(299
)
 
314