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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
 
 
Balance at
Beginning
of Period
 
Charged to
Costs and
Expenses
 
Deductions/
Write-offs
(Recoveries)
 
Balance at
End of
Period
 
 
(In thousands)
Year ended December 31, 2018
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
—

 


 


 
$
—

Year ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
—

 
$
—

 
$
—

 
$
—

Year ended December 31, 2016
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
15

 
$
2

 
$
17

 
$
—