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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock issuance costs | $ 0.1 |  |
At The Market Offering One |  |  |
Stock issuance costs |  | $ 0.2 | $ 0.1
At The Market Offering Two |  |  |
Stock issuance costs |  |  | $ 0.6

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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