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Accounts Receivable
 9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable

Accounts receivable and the related allowance for doubtful accounts are as follows:
 
 
September 30,
2018
 
December 31, 2017
 
(in thousands)
Accounts receivable
$
51,384

 
$
50,457

Less:  Allowance for doubtful accounts
(177
)
 
(119
)
Total, net
$
51,207

 
$
50,338


 
 
Three months ended
 
Nine months ended
 
September 30,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
Allowance for doubtful accounts:
(in thousands)
Balance, beginning of period
$
208

 
$
81

 
$
119

 
$
90

Provisions for losses on accounts receivables, net of recoveries
(31
)
 
39

 
67

 
180

Accounts receivable written off
—

 
—

 
(9
)
 
(150
)
Balance, end of period
$
177

 
$
120

 
$
177

 
$
120