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Schedule II- Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
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, 2014
$
200

 
$
142

 
$
—

 
$
(91
)
 
$
251

Year ended December 31, 2013
200

 
24

 
—

 
(24
)
 
200

Year ended December 31, 2012
450

 
(242
)
 
—

 
(8
)
 
200

Allowance for excess and obsolete inventory:
 
 
 
 
 
 
 
 
 
Year ended December 31, 2014
$
999

 
$
2,157

 
$
—

 
$
(1,802
)
 
$
1,354

Year ended December 31, 2013
2,320

 
595

 
—

 
(1,916
)
 
999

Year ended December 31, 2012
4,431

 
554

 
—

 
(2,665
)
 
2,320

Warranty reserve:
 
 
 
 
 
 
 
 
 
Year ended December 31, 2014
$
955

 
$
396

 
$
—

 
$
(676
)
 
$
675

Year ended December 31, 2013
484

 
1,001

 
—

 
(530
)
 
955

Year ended December 31, 2012
427

 
527

 
—

 
(470
)
 
484