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Treasury Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 14 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 07, 2018 | Aug. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2018
Share Repurchase Program August 2017 |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Common stock repurchase, value |  |  | $ 3.1 |  | $ 3.1 | $ 3.1
Common Stock |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase, shares |  |  |  | 135,000 |  |
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 |  |  |  |  |
Stock repurchase, shares |  |  | 42,995 |  | 193,523 | 328,523
Stock repurchase, average price per share |  |  | $ 11.95 |  | $ 9.49 |
Stock repurchase, cost |  |  | $ 0.5 |  | $ 1.8 |

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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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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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