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Organization and Business Activities (Details) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 20, 2020 USD ($)	Oct. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($) item $ / shares shares	May 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 item	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 11, 2020 USD ($)	Jun. 25, 2019 USD ($)
Liquidity
Cash, cash equivalents and short-term investments			$ 41,400			$ 41,400			$ 41,400
Selling, general and administrative expenses						$ 10,997	$ 676	$ 18,503	35,094	$ 45,339
Number of sales representatives \| item			15		60
Proceeds from at-the-market facility									$ 7,119	$ 23,189
Nominal value \| $ / shares			$ 0.01			$ 0.01			$ 0.01		$ 0.01
Jefferies LLC \| At-the-market offering
Liquidity
Maximum aggregate gross proceeds under the sales agreement													$ 50,000
Proceeds from at-the-market facility						$ 3,400			$ 21,500
Net proceeds from sale of stock		$ 400				$ 3,300			$ 20,500
Jefferies LLC \| At-the-market offering \| Maximum
Liquidity
Proceeds from at-the-market facility		$ 28,100
Jefferies LLC \| At-the-market offering \| Ordinary Shares
Liquidity
Number of shares issued \| shares		762,452				6,044,418			19,161,452
Purchasers \| Purchase agreement
Liquidity
Number of shares issued \| shares				41,445,373							13,793,106
Proceeds from at-the-market facility				$ 38,000							$ 20,100
Number of ordinary shares that can be purchased by warrant holders \| shares				41,445,373							13,793,106
Share and warrant price \| $ / shares				$ 0.91686							$ 1.45
Exercise price \| $ / shares				$ 0.792							$ 1.90
Term				2 years							3 years
Warrants outstanding \| shares			40,595,373			40,595,373			40,595,373
Loan Agreement \| Term loan
Liquidity
Repayment of debt	$ 30,000								$ 30,000
Aggregate principal amount of debt outstanding												$ 35,000