Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Cumulative Effect Changes in Consolidated Balance Sheet (Details)

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Summary of Significant Accounting Policies - Schedule of Cumulative Effect Changes in Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Disposal/transportation accrual $ 1,497 $ 1,616 $ 2,071
Deferred revenue 5,872 5,083 4,311
Accumulated deficit $ (77,245) $ (78,210) (77,893)
Adjustment Due to Topic 606 [Member]      
Disposal/transportation accrual     (455)
Deferred revenue     772
Accumulated deficit     $ (317)