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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net, consisted of the following (in thousands):
 
December 31,
 
2018
 
2017
Accounts receivable
$
188,522

 
$
165,229

Allowance for doubtful accounts
(669
)
 
(73
)
  Accounts receivable, net
$
187,853

 
$
165,156
Schedule of allowance for doubtful accounts
The Company's allowance for doubtful accounts activity was as follows (in thousands):
Year ended December 31,
Balance at
beginning
of year
 
Charges
to expense
 
Charges (credits) to other accounts (deferred revenue)
 
Write-offs
 
Balance at
end of
year
2018
$
73

 
$
351

 
$
620

 
$
(375
)
 
$
669

2017
$
10

 
$
154

 
$
(56
)
 
$
(35
)
 
$
73

2016
$
10

 
$
10

 
$
—

 
$
(10
)
 
$
10