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Trade and Other Receivables, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Accounts Receivable [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable at December 31, 2018 and 2017, consists of the following (in thousands):
 
December 31,
 
2018
 
2017
Accounts receivable
$
38,876

 
$
30,689

Unbilled receivables and contract assets
3,924

 
2,555

Total receivables
42,800

 
33,244

Less: Allowance for doubtful accounts
(978
)
 
(760
)
Trade and other receivables, net
$
41,822

 
$
32,484