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Balance Sheet Components - Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Receivables, Net, Current [Abstract] |  |
Net product receivables | $ 4,473 | $ 0
Collaboration receivables | 2,354 | 17,764
Total accounts receivable, net | $ 6,827 | $ 17,764

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- Definition Collaboration receivables. + References No definition available. + Details
Name: | cytk_CollaborationReceivables
Namespace Prefix: | cytk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net product receivables. + References No definition available. + Details
Name: | cytk_NetProductReceivables
Namespace Prefix: | cytk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesNetCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration