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Organization and Business Activities (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	16 Months Ended
	Aug. 08, 2019	Jun. 30, 2019	Jun. 24, 2019	Jun. 25, 2019	Dec. 31, 2018	Mar. 31, 2018
Liquidity
Cash, cash equivalents and short-term investments		$ 73.9
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		1,221,273	10,316,190
Proceeds from at-the-market facility		$ 3.5	$ 37.8
Net proceeds from sale of stock		3.4	36.9
Value of shares unsold at termination date			$ 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	$ 1.6
Net proceeds from sale of stock	$ 1.6
Jefferies LLC \| At-the-market offering \| Ordinary Shares
Liquidity
Number of shares issued	688,732
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
Maximum borrowing capacity		$ 50.0