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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Summary of Accounts Receivable

 

Accounts receivable consisted of the following:

 

 

December 31,

 

(Table only in thousands)

 

2018

 

 

2017

 

Trade receivables

 

$

7,296

 

 

$

11,603

 

Contract receivables

 

 

48,826

 

 

 

60,543

 

Allowance for doubtful accounts

 

 

(2,897

)

 

 

(4,156

)

Total accounts receivable

 

$

53,225

 

 

$

67,990