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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Changes in Reserve for Product Warranty Claim Costs
Changes in the liability for product warranty claim costs were as follows: 
 
Year Ended December 31,
(In thousands)
2017
 
2016
 
2015
Balance at beginning of period
$
134

 
$
35

 
$
353

Accruals for warranties issued during the period
312

 
102

 
23

Settlements (in cash or in kind) during the period
(107
)
 
(3
)
 
(341
)
Balance at end of period
$
339

 
$
134

 
$
35