Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Assets Retirement Obligations (Details)

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Summary of Significant Accounting Policies - Schedule of Assets Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Balance as of beginning of period $ 2,123 $ 260
Additions 989 0
Liabilities assumed through acquisition 0 1,732
Accretion expense 60 124
Foreign currency translation adjustment (8) 7
Asset retirement obligation as of end of period $ 3,164 $ 2,123