Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Issuance costs	$ 945	$ 1,177	$ 1,177	$ 2,206
Pre-Funded Warrants and Unit Purchase Option [Member]
Issuance costs	$ 945	$ 467	$ 1,177	$ 2,206

The cash outflow for cost incurred directly with the issuance of an equity security.

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

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