Number of new stock issued during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Common stock (Details)		3 Months Ended
Common stock (Details)	Jan. 15, 2023 shares	Mar. 31, 2023 USD ($) Vote $ / shares shares	Mar. 31, 2022 $ / shares	Oct. 14, 2021 USD ($)	Oct. 01, 2021 USD ($)
Common stock voting right \| Vote		1
Securities aggregate price				$ 200,000,000.0
Proceeds from issuance of common stock		$ 34,000
Fair value of common stock \| $ / shares		$ 5.39	$ 10.58
2020 Plan \| Non-employee
Shares issued \| shares	55,250
Open Market Sale
Stock issued \| shares		5,925
Proceeds from issuance of common stock		$ 34,000
Open Market Sale \| Maximum
Securities aggregate price					$ 75,000,000.0