Number of new stock issued during the period.

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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Subsequent Events (Details) - USD ($) $ in Thousands					9 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Oct. 01, 2020	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Sep. 30, 2020	Sep. 30, 2019
Subsequent Event [Line Items]
Net proceeds from sale of common stock		$ 17,000	$ 1,500	$ 900	$ 0	$ 19,411
Subsequent Event [Member] \| At-The-Market Offering Agreement [Member]
Subsequent Event [Line Items]
Shares issued (in shares)	850,000
Net proceeds from sale of common stock	$ 4,600
Net proceeds	$ 4,300