Percentage of commission payable on gross proceeds.

No definition available.

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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.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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Stockholders' equity - Additional information (Details) - USD ($)	1 Months Ended			3 Months Ended	9 Months Ended
	Apr. 30, 2020	Mar. 31, 2019	Aug. 31, 2018	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Proceeds from issuance of common stock, net					$ 9,076,000	$ 5,734,000
Common stock \| Underwritten Public Offering
Class of Stock [Line Items]
Proceeds from issuance of common stock, net	$ 184,000,000.0
Number of shares sold in underwritten public offering	20,400,000
Shares issued price per share (in dollars per share)	$ 9.00
Net proceeds from issuance of common stock	$ 173,000,000.0
2018 Sales Agreement \| Cowen and Company, LLC
Class of Stock [Line Items]
Proceeds from issuance of common stock, net				$ 46,000,000.0
Percentage of commission payable on gross proceeds			3.00%
Number of shares sold in underwritten public offering				2,600,000
Shares issued price per share (in dollars per share)				$ 17.60
Net proceeds from issuance of common stock				$ 44,500,000
2018 Sales Agreement \| Maximum \| Cowen and Company, LLC
Class of Stock [Line Items]
Proceeds from issuance of common stock, net		$ 175,000,000.0	$ 75,000,000.0