Statements of Cash Flows (Parenthetical) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Statements of Cash Flows
Cash issuance costs, Convertible preferred stock	$ 340
Cash issuance cost, Convertible promissory notes	440
Cash issuance costs, Private Placement	$ 1,509

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration