Quarterly report pursuant to Section 13 or 15(d)

Organization And Accounting Policiess (Narrative) (Details)

v3.7.0.1
Organization And Accounting Policiess (Narrative) (Details)
$ in Thousands, XAF in Billions
3 Months Ended
Mar. 31, 2017
USD ($)
item
XAF / $
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
XAF
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Exchange rate | XAF / $ 610.48      
Recorded allowance $ 98 $ 343    
Receivable balance, net 6,496   $ 6,751  
Value Added Tax Reimbursement Monthly Payment $ 200      
Number Of Value Added Tax Reimbursement Payments | item 36      
Gabon [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Recorded allowance $ 100 $ 500    
Receivable balance, gross | XAF       XAF 16.3
Receivable balance, net | XAF       XAF 4.9