Significant Accounting Policies (Narrative) (Details)		1 Months Ended	12 Months Ended
	May 09, 2019	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Oct. 28, 2021 $ / shares	Apr. 30, 2020 USD ($)
Impairment of long-lived assets			$ 0
Impairment of in-process research and development			0
Unrecognized tax benefits			$ 0	$ 0
Conversion ratio of reverse stock split	0.0714		0.0714
Common stock, par value (in dollars per share) | $ / shares			$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized | shares			217,000,000	217,000,000
Lease liability			$ 37,989,000			$ 11,700,000
Right-of-use asset			35,852,000	$ 10,790,000		$ 11,000,000.0
Accumulated deficit			(202,857,000)	(179,702,000)
Goodwill, Impairment Loss			$ 0
Estimated incremental borrowing rate (as a percent)						12.89%
Australian Taxation Office [Member]
Tax rebates received		$ 200,000		$ 700,000