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Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Aug. 31, 2020	Sep. 30, 2019
Convertible preferred stock warrant liability
Debt Instrument [Line Items]
Issuance costs of warrants		$ 0.6
Exercise price		$ 0.80
Loan and security agreement | Horizon Technology Finance Corporation
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 20.0
Interest rate on first business day of month (as a percent)		2.20%
Term (in months)	30 months	36 months
Final payment		$ 0.7
Percentage of final payment on original principal		3.50%
Minimum cash on deposit requirement		$ 5.0
Debt issuance costs and discounts		1.1
Legal fees and an investment bank fee		$ 0.5
Loan and security agreement | LIBOR | Horizon Technology Finance Corporation
Debt Instrument [Line Items]
Interest rate (as a percent)		10.00%

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- Definition

The amount of final payment of debt instrument.

+ References

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- Definition

Maximum amount that can be borrowed under the debt instrument.

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- Definition

The amount of minimum cash on deposit requirement.

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- Definition

The percentage of final payment on original principal.

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- Definition

The amount of issuance costs of warrants.

+ References

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- Definition

The amount of legal fees and an investment bank fee.

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- Definition

The percentage of threshold interest rate on the first business day of the month.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

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