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Treasury Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 07, 2018 | Sep. 09, 2019 | Aug. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2019
Share Repurchase Program August 2017 |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase, value |  |  |  | $ 3.6 | $ 3.6
Common Stock | 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 |  |  |  |
Common Stock | 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 |  |  |
Common Stock | Share Repurchase Program August 2017 and September 2019 |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase, shares |  |  |  | 48,000 | 63,000
Stock repurchase, average price per share |  |  |  | $ 12.54 | $ 12.75
Stock repurchase, cost |  |  |  | $ 0.6 | $ 0.8

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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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