Aggregate number of common shares reserved for future issuance.

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=6877327&loc=d3e13212-122682

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

Subsequent Event - Additional Information (Details) - shares	Jul. 21, 2020	Jun. 30, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Number of shares of common stock reserved for future issuance		5,982,476	4,162,361
Subsequent Event
Subsequent Event [Line Items]
Number of shares of common stock reserved for future issuance	14,855,157