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Organization and Business Activities (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	19 Months Ended
	Nov. 12, 2019	Sep. 30, 2019	Sep. 30, 2019	Jun. 25, 2019	Dec. 31, 2018	Mar. 31, 2018
Liquidity
Cash, cash equivalents and short-term investments		$ 78.3	$ 78.3
Cantor Fitzgerald and Co. \| At-the-market offering \| Ordinary Shares
Liquidity
Maximum aggregate gross proceeds under the sales agreement						$ 50.0
Number of shares issued			10,316,190
Proceeds from at-the-market facility			$ 37.8
Net proceeds from sale of stock			36.9
Value of shares unsold at termination date		12.2	12.2
Jefferies LLC \| At-the-market offering
Liquidity
Maximum aggregate gross proceeds under the sales agreement				$ 50.0
Proceeds from at-the-market facility	$ 0.7	9.6
Net proceeds from sale of stock	$ 0.7	$ 9.0
Jefferies LLC \| At-the-market offering \| Ordinary Shares
Liquidity
Number of shares issued	356,280	4,101,282
Loan Agreement \| Term loan
Liquidity
Maximum borrowing capacity					$ 75.0
Loan Agreement \| Term loan \| Initial Advance
Liquidity
Maximum borrowing capacity					$ 25.0
Loan Agreement \| Term loan \| Additional term loan advances
Liquidity
Proceeds from Credit		$ 10.0
Maximum borrowing capacity		$ 40.0	$ 40.0