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ACCOUNTS RECEIVABLE, NET (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net, consisted of the following (in thousands):
 
December 31,
 
2017
 
2016
Accounts receivable
$
165,229

 
$
53,872

Allowance for doubtful accounts
(73
)
 
(10
)
  Accounts receivable, net
$
165,156

 
$
53,862
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
2017
$
10

 
$
154

 
$
(56
)
 
$
(35
)
 
$
73

2016
$
10

 
$
10

 
$
—

 
$
(10
)
 
$
10

2015
$
58

 
$
17

 
$
—

 
$
(65
)
 
$
10