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Shareholders' Equity - Textual (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 16, 2017 | Feb. 16, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |
Exercise of stock options, common stock issued (in shares) |  |  | 499,671 | 0 |
Weighted average exercise price, exercised (in USD per share) |  |  | $ 1.62 |  |
Period under program | 1 year | 1 year |  |  |
Authorized repurchase amount | $ 5,000,000 | $ 15,000,000 |  |  |
Treasury stock (in shares) |  |  | 12,253,502 |  | 12,253,502
Treasury stock, shares held at cost |  |  | $ 18,929,915 |  | $ 18,929,915

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Common Stock Issued + References No definition available. + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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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 Number of previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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