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Accounts Receivable
 6 Months Ended
Jun. 30, 2019
Accounts Receivable, Net, Current [Abstract]  
Accounts Receivable
Accounts Receivable
 
Accounts receivable consisted of the following (in thousands):
 
June 30,
2019
 
December 31,
2018
Total receivables
$
11,608

 
$
13,634

Allowance for doubtful accounts and returns
(359
)
 
(390
)
Accounts receivable, net
$
11,249

 
$
13,244


 
Accounts receivable included unbilled receivable of $1.5 million and $2.2 million at June 30, 2019 and December 31, 2018, respectively. Write-offs related to accounts receivable were approximately $32,000 and $39,000 for the three months ended June 30, 2019 and 2018, respectively, and $32,000 and $65,000 for the six months ended June 30, 2019 and 2018, respectively.

Summary of allowance for doubtful accounts and returns activity was as follows (in thousands):
 
June 30,
2019
 
December 31,
2018
Beginning balance
(390
)
 
(635
)
Provision for bad debts on trade receivables
19

 
72

Other allowances
(20
)
 
58

Accounts receivable write offs
32

 
115

Ending balance
$
(359
)
 
$
(390
)