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CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Stock issuance expenses | $ 800 | $ 776 | $ 93
Series D Convertible Preferred Stock |  |  |
Discount of issuance of common stock, preferred stock and warrants for clinical trial funding commitment |  |  | $ 488

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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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