Organization and Operations - January 2020 Financing (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
Jan. 30, 2020	Dec. 31, 2020
Common stock
January 2020 Financing
Issuance of stock, net of issuance costs (in shares)		881,666
January 2020 Financing
January 2020 Financing
Gross proceeds from sale of stock in public offering	$ 26.5
Proceeds from public offering, net of issuance costs	$ 24.6
January 2020 Financing \| Common stock
January 2020 Financing
Issuance of stock, net of issuance costs (in shares)	881,666
Share price (in dollars per share)	$ 30.00
January 2020 Financing \| Oppenheimer & Co. Inc
January 2020 Financing
Issuance of stock, net of issuance costs (in shares)	115,000

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

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration