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Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Noncontrolling Interest [Line Items] |  |  |  |
Decrease in noncontrolling interest |  | $ 300 | $ 500 |
Noncontrolling interests | $ 117 | 117 |  | $ 411
Retained earnings (accumulated deficit) | (653) | (653) |  | (2,072)
Transition expenses | 1,500 | 1,500 |  |
Accrued transition costs | 1,400 | 1,400 |  |
Accrued Severance and Rent Costs |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Accrued severance and rent costs | $ 400 | $ 400 |  | 800
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Retained earnings (accumulated deficit) |  |  |  | $ 900

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