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Related Person Transactions - TRMT 2019 Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | May 21, 2019 | Sep. 30, 2020
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TRMT | Tremont Advisors |  |
Related Party Transaction [Line Items] |  |
Number of shares owned (in shares) |  | 1,600,100
Ownership percentage |  | 19.30%
Common shares | TRMT | Underwritten Public Offering |  |
Related Party Transaction [Line Items] |  |
Number of shares issued (in shares) | 5,000,000 |
Common stock, par value (in dollars per share) | $ 0.01 |
Share purchase from related party (in shares) | 1,000,000 |
Purchase from related party | $ 5,650 |

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