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Product Warranty (Tables)
 3 Months Ended
Mar. 31, 2016
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
The following table summarizes the activity related to the product warranty liability during the three months ended March 31, 2016 (in thousands):

Balance at beginning of the period
 
$
593

Cost of warranty claims
 
—

Accruals for product warranties
 
(3
)
Balance at end of the period
 
$
590