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shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Otuska Otuska Pharmaceutical Co., Ltd. [Member] Otuska Pharmaceutical Co., Ltd. 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Prepaid expenses and deposits Prepaid Expenses and Deposits Current Prepaid Expenses and Deposits Current Cost of revenue Cost of Revenue Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Unrealized (loss) gain on available-for-sale securities Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Shares Common Stock [Member] Available-for-sale debt securities Estimated Fair Value Debt Securities, Available-for-Sale Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Deferred revenue, less current portion Deferred Revenue, Noncurrent Equity Awards Adjustments Equity Awards Adjustments [Member] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Total liabilities and shareholders' equity Liabilities and Equity Stock Options Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Short-term investments Debt Securities, Current Tabular List, Table Tabular List [Table Text Block] Schedule of Share-based Compensation Expense Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Other (income) expense, net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders' equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Acquired in-process research and development Asset Acquisition, Intangible Asset Assumed, Acquired In Process Research And Development Asset Acquisition, Intangible Asset Assumed, Acquired In Process Research And Development Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Selling, general and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Finance lease, interest payment Finance Lease, Interest Payment on Liability Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets, Fair Value Disclosure Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other, net Other Noncash Income (Expense) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total purchase consideration Asset Acquisition, Assets Acquired And Liabilities Assumed, Net Asset Acquisition, Assets Acquired And Liabilities Assumed, Net Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Achievement obtained, tranche grant period following achievement (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Achievement Obtained, Tranche Grant Period Share-Based Compensation Arrangement by Share-Based Payment Award, Achievement Obtained, Tranche Grant Period Accrued interest receivable Interest Receivable Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Finance Lease Payments Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Accrued sales rebates and fees Accrued Sales Rebate And Fees, Current Accrued Sales Rebate And Fees, Current Company Selected Measure Amount Company Selected Measure Amount Kezar Life Sciences, Inc. Kezar Life Sciences, Inc. [Member] Kezar Life Sciences, Inc. Amortization and depreciation Depreciation, Depletion and Amortization Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense Income tax expense Income Tax Expense (Benefit) Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from issuance of common shares for equity awards Proceeds from Stock Options Exercised Interest income Investment Income, Interest Accounts receivable, net Increase (Decrease) in Receivables Transaction costs Asset Acquisition, Consideration Transferred, Transaction Cost Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Accrued corporate and excise taxes Accrued Income Taxes Foreign exchange (gain) loss on revaluation of Monoplant finance lease liability Foreign Translation Gain (Loss) On Revaluation Of Finance Lease Liability Foreign Translation Gain (Loss) On Revaluation Of Finance Lease Liability Revenue Revenues [Abstract] Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]