Contingencies (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Jan. 31, 2020
Contingencies
Contingent fee		$ 500,000
Contingent fee accrual	$ 0
Legal and financial advisory expenses - unsolicited bid and related matters	$ 1,323,000

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant