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Non-consolidated Variable Interest Entity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Cash [Abstract]    
Total assets $ 71,424 $ 61,440
Liabilities [Abstract]    
Total liabilities $ 44,156 $ 30,311
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 155  
Total assets 155  
Liabilities [Abstract]    
Credit card and other payables 1  
Total liabilities 1  
Total net assets 154  
Maximum exposure to loss $ 154