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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable
 
December 31,
 
2017
 
2016
 
(in thousands)
Accounts receivable
$
50,457

 
$
43,091

Less:  Allowance for doubtful accounts
(119
)
 
(90
)
Total, net
$
50,338

 
$
43,001
Accounts Receivable (Allowance)
 
Years Ending December 31,
 
2017
 
2016
 
2015
Allowance for doubtful accounts:
(in thousands)
Balance, beginning of period
$
90

 
$
115

 
$
171

Provisions for losses on accounts receivables, net of adjustments
179

 
(25
)
 
(48
)
Accounts receivable written off, net of recoveries
(150
)
 
—

 
(8
)
Balance, end of period
$
119

 
$
90

 
$
115