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Stockholders' Equity - Share-based Compensation Omnibus Incentive Plan (Details) - 2014 Omnibus Incentive Plan - shares | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2021 | Dec. 31, 2018 | May 22, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Maximum number of shares of common stock authorized (in shares) |  |  | 4,250,000
Additional shares added by amended plan (in shares) | 2,999,054 | 2,199,114 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition Number of shares authorized for issuance 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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