Subsequent Events (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Subsequent Event [Line Items]
Common Stock, Shares Authorized		90,000,000			90,000,000
Proceeds From Issuance Of Common Stock		$ 104,615		$ 57,845
Common Stock [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues		1,400,251		874,268
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Shares Authorized	2,875,000
Stock Issued During Period, Shares, New Issues	2,875,000
Proceeds From Issuance Of Common Stock	$ 170,400
At-Market Equity Program Two [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues		1,245,118	444,228
Proceeds From Issuance Of Common Stock			$ 33,000
Over-Allotment Option [Member] | Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Shares Authorized	375,000