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Related Party Transactions - Additional Information (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Spectrum Inc. |
Related Party Transaction [Line Items] |
Spectrum Acquisition, tax preparation and other fees | $ 207,000
Principal Owner |
Related Party Transaction [Line Items] |
Rent Expense | 555,000
Accrued refunds current | $ 1,728,000
Principal Owner | Minimum |
Related Party Transaction [Line Items] |
Non controlling ownership interest minimum | 10.00%

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