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Change in Capital Structure (Details) $ / shares in Units, $ in Thousands |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 24, 2018 USD ($) | Sep. 20, 2018 USD ($) $ / shares shares | Jul. 06, 2018 | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 $ / shares shares | Jun. 26, 2018 $ / shares shares
Change in Capital Structure [Abstract] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  | 50,000,000 |  | 50,000,000 | 50,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | shares |  |  |  | 1,000,000 |  | 1,000,000 | 1,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01
Stock split ratio |  |  | 24 |  |  |  |
Deferred income tax benefit | $ | $ (863) |  |  | $ (85) | $ 0 |  |
Initial Public Offering [Member] |  |  |  |  |  |  |
Change in Capital Structure [Abstract] |  |  |  |  |  |  |
Sold and issued shares of common stock (in shares) | shares |  | 2,900,000 |  |  |  |  |
Common stock price per share (in dollars per share) | $ / shares |  | $ 19 |  |  |  |  |
Net proceeds from initial public offering | $ |  | $ 50,100 |  |  |  |  |
Non-voting Common Stock [Member] |  |  |  |  |  |  |
Change in Capital Structure [Abstract] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  | 20,000,000 |  | 20,000,000 | 20,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01

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