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Debt - Additional Information (Detail) |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |

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