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Summary of Significant Accounting Policies - Schedule of Cumulative Effect Changes in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disposal/transportation accrual | $ 1,449 | $ 1,616 | $ 2,071
Deferred revenue | 4,472 | 5,083 | 4,311
Accumulated deficit | $ (77,465) | $ (78,210) | (77,893)
Adjustment Due to Topic 606 [Member] |  |  |
Disposal/transportation accrual |  |  | (455)
Deferred revenue |  |  | 772
Accumulated deficit |  |  | $ (317)

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