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Accounts Receivable, net (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Summary of accounts receivable, net
Accounts receivable, net, consists of the following: 
 
June 30,
2017
 
December 31,
2016
 
(in thousands)
Accounts receivable, gross (includes $4,623 of unsettled sales of short term investments)
$
45,894

 
$
39,869

Less allowance for doubtful accounts
(1,114
)
 
(142
)
Total accounts receivable, net
$
44,780

 
$
39,727