The total number of new claims filed pertaining to a loss contingency during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies (Details) - numberOfLawsuits	Oct. 04, 2019	Sep. 30, 2020
Loss Contingencies [Line Items]
Number of pending claims		6
Class Action Lawsuits Filed in the State of California, San Mateo County
Loss Contingencies [Line Items]
Number of pending claims		4
Class Action Lawsuits Filed in the U.S. District Court
Loss Contingencies [Line Items]
Number of claims filed	2