Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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

Subsequent Events (Details) - NG Advantage			1 Months Ended	12 Months Ended
Subsequent Events (Details) - NG Advantage	Oct. 01, 2018	Feb. 28, 2018	Feb. 29, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Percentage of ownership after transaction	61.70%	53.50%		64.60%
Subsequent Event
Subsequent Event [Line Items]
Percentage of ownership after transaction			93.20%