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Non-consolidated Variable Interest Entity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Cash [Abstract]    
Contract receivables, net $ 19,065 $ 21,077
Total assets 68,996 61,440
Liabilities [Abstract]    
Total liabilities 41,375 $ 30,311
Carrying value $ 0  
DP Engineering Ltd, Co [Member]    
Variable Interest Entity [Line Items]    
Ownership percentage 48.00%  
Contribution amount $ 48  
NXA Consultants LLC [Member]    
Variable Interest Entity [Line Items]    
Ownership percentage 52.00%  
Contribution amount $ 52  
Variable Interest Entity, Not Primary Beneficiary [Member]    
Cash [Abstract]    
Checking account 184  
Total assets 184  
Liabilities [Abstract]    
Credit card and other payables 184  
Total liabilities 184  
Total net assets 0  
Maximum exposure to loss $ 0