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Organization and Business Activities (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended	12 Months Ended		14 Months Ended
	Apr. 03, 2020	Apr. 01, 2020	Dec. 20, 2019	Dec. 31, 2019	Jan. 12, 2020	Dec. 31, 2019	Mar. 12, 2020	Mar. 11, 2020	Jun. 25, 2019
Liquidity
Cash, cash equivalents and short-term investments				$ 86.6		$ 86.6
Jefferies LLC \| At-the-market offering
Liquidity
Maximum aggregate gross proceeds under the sales agreement									$ 50.0
Proceeds from at-the-market facility						14.4
Net proceeds from sale of stock						$ 13.6
Jefferies LLC \| At-the-market offering \| Ordinary Shares
Liquidity
Number of shares issued						6,505,268
Jefferies LLC \| Estimate \| At-the-market offering \| Maximum
Liquidity
Proceeds from at-the-market facility					$ 35.6		$ 35.6
Purchasers \| Purchase agreement
Liquidity
Number of shares issued			13,793,106	13,793,106
Proceeds from at-the-market facility			$ 20.1	$ 20.1
Number of ordinary shares that can be purchased by warrant holders			13,793,106	13,793,106		13,793,106
Share and warrant price			$ 1.45	$ 1.45
Exercise price			$ 1.90	$ 1.90		$ 1.90
Term			3 years	3 years		3 years
Subsequent Event \| Loan Agreement \| Term loan
Liquidity
Repayment of debt	$ 30.0	$ 30.0
Aggregate principal amount of debt outstanding								$ 35.0