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Stock-based Compensation - Performance-based stock options (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based compensation |  |  |  |  |
Stock-based compensation expense | $ 773 | $ 1,011 | $ 2,561 | $ 2,739 |
Stock Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Unrecognized compensation expense related to stock options (in dollars) | $ 4,000 |  | $ 4,000 |  |
Stock Options Vesting Based On Performance |  |  |  |  |
Share-based compensation |  |  |  |  |
Number of options outstanding, non-vested options | 0 |  | 0 |  | 41,250
Grant date fair value |  |  |  |  | $ 200
Stock-based compensation expense |  |  |  |  | $ 200
Unrecognized compensation expense related to stock options (in dollars) | $ 0 |  | $ 0 |  |

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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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