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Schedule II- Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2015
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, 2015
$
251

 
$
86

 
$
—

 
$
(15
)
 
$
322

Year ended December 31, 2014
200

 
142

 
—

 
(91
)
 
251

Year ended December 31, 2013
200

 
24

 
—

 
(24
)
 
200

Warranty reserve:
 
 
 
 
 
 
 
 
 
Year ended December 31, 2015
$
675

 
$
(62
)
 
$
—

 
$
(299
)
 
$
314

Year ended December 31, 2014
955

 
396

 
—

 
(676
)
 
675

Year ended December 31, 2013
484

 
1,001

 
—

 
(530
)
 
955