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Product Warranty (Tables)
 3 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of activity related to the product warranty liability
The following table summarizes the activity related to the product warranty liability during the three months ended March 31, 2017 (in thousands):
Balance at beginning of the period
 
$
587

Reversed to expense
 
(14
)
Cost of warranty claims
 
2

Balance at end of the period
 
$
575