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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - Common Stock - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 22, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Issuance costs |  | $ 30 | $ 831
IPO |  |  |
Issuance costs | $ 4,861 | $ 8,000 |

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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=118932676&loc=d3e3291-108585 + Details
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