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Nature of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net
Changes to the allowance for doubtful accounts consisted of the following (in thousands):
 
 
Year Ended December 31,
Allowance for Doubtful Accounts:
 
2018
 
2017
 
2016
Balance at beginning of year
 
$
21

 
$
34

 
$
24

Write-offs
 
—

 
(11
)
 
(11
)
Change in provision
 
40

 
(2
)
 
21

Balance at end of year
 
$
61

 
$
21

 
$
34