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Exercise price per share or per unit of warrants or rights outstanding.

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Organization and Business Activities (Details) - USD ($)				1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	May 29, 2020	May 08, 2020	Mar. 20, 2020	May 31, 2020	Apr. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 11, 2020	Jun. 25, 2019
Liquidity
Cash, cash equivalents and short-term investments						$ 50,100,000		$ 50,100,000
Selling, General and Administrative Expense					$ 676,000	$ 8,072,000	$ 13,427,000	$ 24,097,000	$ 26,836,000
Nominal value						$ 0.01		$ 0.01		$ 0.01
Jefferies LLC \| At-the-market offering
Liquidity
Maximum aggregate gross proceeds under the sales agreement												$ 50,000,000.0
Proceeds from at-the-market facility						$ 3,400,000		$ 18,000,000.0
Net proceeds from sale of stock						$ 3,300,000		$ 17,200,000
Jefferies LLC \| At-the-market offering \| Maximum
Liquidity
Proceeds from at-the-market facility		$ 32,000,000.0
Jefferies LLC \| At-the-market offering \| Ordinary Shares
Liquidity
Number of shares issued						6,133,108		13,117,034
Purchasers \| Purchase agreement
Liquidity
Number of shares issued				41,445,373						13,793,106
Proceeds from at-the-market facility				$ 38,000,000.0						$ 20,100,000
Number of ordinary shares that can be purchased by warrant holders				41,445,373						13,793,106
Share and warrant price	$ 0.91686									$ 1.45
Exercise price				$ 0.792						$ 1.90
Term				2 years						3 years
Loan Agreement \| Term loan
Liquidity
Repayment of debt			$ 30,000,000.0					$ 30,000,000.0
Aggregate principal amount of debt outstanding											$ 35,000,000.0