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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock option activity |  |
Options outstanding (in shares) | 77,070 |
Options exercised (in shares) | (100) |
Options outstanding (in shares) | 76,970 |
Options vested or expected to vest (in shares) | 76,970 |
Options exercisable (in shares) | 76,970 |
Stock option activity, weighted average exercise price |  |
Options Outstanding, weighted average exercise price (in dollars per share) | $ 10.06 |
Options exercised, weighted average exercise price (in dollars per share) | 8.02 |
Options Outstanding, weighted average exercise price (in dollars per share) | 10.06 |
Options vested or expected to vest, weighted average exercise price (in dollars per share) | 10.06 |
Options exercisable, weighted average exercise price (in dollars per share) | $ 10.06 |
Options outstanding, weighted average remaining contractual term | 1 year 3 months 7 days |
Options vested or expected to vest, weighted average remaining contractual term | 1 year 3 months 7 days |
Options exercisable, weighted average remaining contractual term | 1 year 3 months 7 days |
Options outstanding, aggregate intrinsic value | $ 653 |
Options vested or expected to vest, aggregate intrinsic value | 653 |
Options exercisable, aggregate intrinsic value | 653 |
Intrinsic value of options exercised | 1 | $ 349
Cash received from options exercised | 1 | 207
Excess tax benefit realized for options exercises | $ 0 | $ 72
Granted (in shares) | 0 | 0

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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