Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies - Litigation (Details) - item	Feb. 04, 2019	Nov. 30, 2019	Aug. 12, 2019
Loss Contingencies [Line Items]
Threshold period for not filing response to complaint	30 days
Case of Novitzki vs Zaderej
Loss Contingencies [Line Items]
Minimum number of candidates elected to board		6	3