Significant Accounting Policies - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended	23 Months Ended
	Aug. 31, 2020 USD ($)	May 31, 2016 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 CAD ($) shares	Mar. 31, 2022 $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 CAD ($) shares
Summary Of Significant Accounting Policies [Line Items]
Money market investments			$ 14,915	$ 14,915	$ 14,915			$ 21,100
Cash			278	278	278	$ 37			$ 34
FDIC insured amount			$ 250	$ 250	$ 250
Warrants exercise price | $ / shares			$ 6.80	$ 6.80	$ 6.80		$ 6.80	$ 6.80
Class of Warrant or Right, Outstanding | shares			39	39	39	39	39	39	39
Percentage of royalties	5.00%			5.00%
Unrealized loss on Processa shares			$ 8		$ 25
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Money market investments			$ 14,637	$ 14,637	$ 14,637
Elion
Summary Of Significant Accounting Policies [Line Items]
Cash	$ 100
Eniluracil | Elion
Summary Of Significant Accounting Policies [Line Items]
Cash proceeds from sale of Eniluracil		$ 40
Percentage of royalties		5.00%