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Treasury Stock - Additional Information (Details) - Common Stock - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 09, 2019 | Aug. 07, 2018 | Aug. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Share Repurchase Program August 2017 |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock approved for repurchase, value |  |  |  | $ 7.0 |  |
Period of stock repurchase program |  |  |  | 12 months |  |
Additional period of stock repurchase program |  |  | 12 months |  |  |
Share Repurchase Program September 9, 2019 |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock approved for repurchase, value |  | $ 7.0 |  |  |  |
Period of stock repurchase program |  | 12 months |  |  |  |
Share Repurchase Program August 2017 and September 2019 |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase, shares | 465,000 |  |  |  | 108,000 | 222,000
Stock repurchase, weighted average price per share | $ 10.02 |  |  |  | $ 11.41 | $ 9.92
Stock repurchase, cost | $ 4.7 |  |  |  | $ 1.2 | $ 2.2

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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