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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
Changes in the Company’s warranty reserves are as follows:
 
Year Ended December 31,
 
2010

2011

2012
Balance, beginning of the year
$
700


$
1,654


$
1,406

Accruals
2,363


1,987


2,482

Warranty Liability assumed in acquisition
—


—


225

Usage
(1,409
)

(2,235
)

(2,089
)
Balance, end of the year
$
1,654


$
1,406


$
2,024