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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Changes in the Liability for Product Warranty Claim Costs
Changes in the liability for product warranty claim costs were as follows: 
 
Year Ended December 31,
(In thousands)
2019
 
2018
 
2017
Balance at beginning of period
$
276

 
$
339

 
$
134

Accruals for warranties issued during the period
1,742

 
787

 
312

Settlements (in cash or in kind) during the period
(504
)
 
(850
)
 
(107
)
Balance at end of period
$
1,514

 
$
276

 
$
339