Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Stockholders' Equity - Common Stock (Details)	Jun. 30, 2021 Vote shares	Dec. 31, 2020 shares	Aug. 31, 2018 $ / shares shares
Class of Stock [Line Items]
Common shares, shares issued (in shares)	243,076	243,076
Common shares, votes per share \| Vote	1
RA Capital Healthcare Fund, L.P
Class of Stock [Line Items]
Common shares, shares issued (in shares)			241,467
Share price \| $ / shares			$ 0.0012