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Debt - Additional Information (Detail)			3 Months Ended		5 Months Ended	6 Months Ended
Debt - Additional Information (Detail)	Jul. 06, 2021 USD ($)	Aug. 13, 2020 USD ($) Installment	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Oct. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)
Interest expense			$ 296,000			$ 590,000
SVB Term Loan [Member]
Debt instrument, principal amount		$ 14,000,000.0	14,000,000			$ 14,000,000		$ 14,000,000
Interest-only payment period		24 months
Loan payment, number of consecutive equal monthly installments of principal including accrued interest \| Installment		24
Debt instrument, maturity date						Feb. 01, 2024
Debt instrument, final payment fee amount		$ 1,200,000	1,200,000			$ 1,200,000
Debt default additional interest charge		5.00%
Debt finance costs									$ 57,000
Amortization of deferred financing charges			5,000			11,000
Unamortized deferred charges			36,000			36,000		48,000
Financing costs paid									$ 27,000
Accretion loan discounts			2,000			5,000
Loan discounts-financing costs			18,000			18,000		23,000
Debt instrument, accrued final payment fee			420,000			$ 420,000		183,000
Contingent interest rate increase						2.00%
Fair value of liabilities			34,000			$ 34,000
Amortization of term loan			19,000			37,000
Term loan discount interest			121,000			121,000		158,000
Interest expense			296,000	$ 0		590,000	$ 0
SVB Term Loan [Member] \| Term Loan Derivative Liability [Member]
Term loan derivative liability		$ 187,000	$ 162,000			$ 162,000		$ 196,000
SVB Term Loan [Member] \| Term Loan Derivative Liability [Member] \| Contingent Interest Rate Increase [Member]
Derivative liability, measurement input			0.0200			0.0200
SVB Term Loan [Member] \| Term Loan Derivative Liability [Member] \| Discount Rate [Member]
Derivative liability, measurement input			0.120			0.120
SVB Term Loan [Member] \| Minimum [Member]
Interest rate, floating		4.25%
Long term debt percentage bearing adjusted floating interest rate		6.25%
SVB Term Loan [Member] \| First Amendment
Debt instruments percentage of required to deposit unrestricted and unencumbered cash collateral	100.00%
Equity raise requirements, description						if the Company fails to receive positive data in its Phase 2b/3 PRISM trial or to meet certain equity raise requirements, including raising at least $15.0 million in net proceeds from the sale of equity securities during the period from June 1, 2021 through October 31, 2021 and raising by June 30, 2022, sufficient additional net proceeds from the sale of equity securities to finance its planned second phase 3 clinical trial of Haduvio for prurigo nodularis and its ongoing operations (each a “Milestone Condition”), the Company will be required to deposit unrestricted and unencumbered cash equal to 100% of the principal amount of the SVB Term Loan then outstanding in a cash collateral account with SVB, which can be used by SVB to prepay the SVB Term Loan at any time.
Debt instruments amount of required to maintain unrestricted and unencumbered cash	$ 20,000,000.0
SVB Term Loan [Member] \| Prepayment Prior to First Anniversary of Effective Date [Member]
Prepayment premium percentage on principal amount		3.00%
SVB Term Loan [Member] \| Prepayment After First Anniversary of Effective Date and Prior To Second Anniversary of Effective Date [Member]
Prepayment premium percentage on principal amount		2.00%
SVB Term Loan [Member] \| Prepayment After Second Anniversary of the Effective Date and Prior to February 1, 2024 [Member]
Prepayment premium percentage on principal amount		1.00%
SVB Term Loan [Member] \| Prime Rate [Member]
Variable interest rate		1.00%
SVB Term Loan [Member] \| Adjusted Prime Rate [Member]
Variable interest rate		3.00%
SVB Term Loan [Member] \| Scenario Forecast [Member] \| First Amendment \| Minimum [Member]
Proceeds from the sale of equity securities					$ 15,000,000.0