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Treasury Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 13 Months Ended
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Sep. 09, 2020 | Aug. 07, 2018 | Sep. 09, 2019 | Aug. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020
Share Repurchase Program September 9, 2019 |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase, shares |  |  |  |  |  |  | 162,000
Common stock repurchase, value |  |  |  |  | $ 1.6 | $ 1.6 | $ 1.6
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 |  |  |  |
Additional 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 |  |  |  |  | 0 | 69,000 |
Stock repurchase, average price per share |  |  |  |  |  | $ 8.78 |
Stock repurchase, cost |  |  |  |  |  | $ 0.6 |

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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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