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Subsequent Events - 2015 Plan Narrative (Details) - Stock Awards - 2015 Stock Awards Plan - $ / shares |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 10, 2021 | Nov. 10, 2020 | Feb. 05, 2020 | Feb. 06, 2019 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |
Granted (in shares) |  | 50,000 | 45,418 | 44,949 |
Award vesting rights, percentage |  |  |  |  | 20.00%
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Granted (in shares) | 15,181 |  |  |  |
Granted (in dollars per share) | $ 8.575 |  |  |  |
Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Award vesting rights, percentage |  |  | 20.00% | 20.00% |
Minimum | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Percentage of vesting of award 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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