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Accrued Warranty (Tables)
 3 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of accrual for product warranty
The following summarizes the activity in the Company’s accrual for product warranty (in thousands):
 
 
Three Months Ended
March 31,
 
2017
 
2016
Balance at beginning of period
$
338

 
$
228

Accrued warranty expense
5

 
61

Warranty claims paid
(18
)
 
(47
)
Balance at end of period
$
325

 
$
242