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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 03, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Spectrum Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Spectrum Acquisition, tax preparation and other fees |  | $ 0.4 | $ 0.2
Principal Owner |  |  |
Related Party Transaction [Line Items] |  |  |
Accrued refunds current |  |  | $ 1.7
Principal Owner | Spectrum Inc. | IPO [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Outstanding common stock until the company completed its public offering | 3,144,531 |  |
Principal Owner | Minimum | Spectrum Inc. | IPO [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Non controlling ownership interest minimum | 10.00% |  |

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