Professional and Legal Fees Related to the BW Proposal (Details)	3 Months Ended
	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)
Professional and Legal Fees Related to the BW Proposal
Costs for professional (including investment banking fees) and legal services incurred in connection with BW’s unsolicited acquisition proposal and proxy contest		$ 483,000
BW
Professional and Legal Fees Related to the BW Proposal
Number of directors proposed to be replaced in BW proposal | item	3
Costs for professional (including investment banking fees) and legal services incurred in connection with BW’s unsolicited acquisition proposal and proxy contest	$ 0	$ 500,000