XML 31 R18.htm IDEA: XBRL DOCUMENT
v3.26.1

Cash, Cash Equivalents and Marketable Securities | 3 Months Ended
--- | ---
Mar. 31, 2026
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Cash, Cash Equivalents and Marketable Securities | Cash, cash equivalents and marketable securities The following table summarizes the amortized cost, gross unrealized gains and losses and the fair value of our cash, cash equivalents and marketable securities, all of which are considered available for sale, by type of securities (in millions):
Types of securities as of March 31, 2026 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Money market funds |  | $ | 171 |  |  | $ | — |  |  | $ | — |  |  | $ | 171 |
U.S. treasury securities |  | 305 |  |  | — |  |  | — |  |  | 305 |
Corporate securities and commercial paper |  | 395 |  |  | — |  |  | (1) |  |  | 394 |
Certificate of deposit |  | 6 |  |  | — |  |  | — |  |  | 6 |
Total cash, cash equivalents and marketable securities |  | $ | 877 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 876 |
Types of securities as of December 31, 2025 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Money market funds |  | $ | 155 |  |  | $ | — |  |  | $ | — |  |  | $ | 155 |
U.S. treasury securities |  | 359 |  |  | — |  |  | — |  |  | 359 |
Corporate securities and commercial paper |  | 487 |  |  | — |  |  | — |  |  | 487 |
Certificate of deposit |  | 9 |  |  | — |  |  | — |  |  | 9 |
Total cash, cash equivalents and marketable securities |  | $ | 1,010 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,010 |
The following table summarizes the fair values of our cash, cash equivalents and marketable securities by location in the Condensed Consolidated Balance Sheets and contractual maturity (in millions):
Location in Condensed Consolidated Balance Sheets |  | Contractual Maturity |  | March 31, 2026 |  | December 31, 2025
Cash and cash equivalents |  | — |  | $ | 201 |  |  | $ | 222 |
Marketable securities |  | Within one year |  | 621 |  |  | 759 |
Long-term marketable securities |  | Between one and three years |  | 54 |  |  | 29 |
Total cash, cash equivalents and marketable securities |  |  |  | $ | 876 |  |  | $ | 1,010 |
Realized gains or losses recognized on the sale of available-for-sale marketable securities were not material for the three months ended March 31, 2026 and 2025 and are included in Interest and other income, net, in the Condensed Consolidated Statements of Operations. The cost of a security sold is determined using the specific-identification method. We limit the credit risk associated with our investments by placing them with banks and institutions we believe are highly creditworthy and investing in highly rated investments. We held a total of 100 and 31 positions in securities which were in unrealized loss positions as of March 31, 2026 and December 31, 2025, respectively. We do not intend to sell our securities with unrealized loss positions and have concluded we will not be required to sell the securities before recovery of the amortized cost for the investment at maturity. No credit related losses have been recognized for any of the periods presented. The following table provides a reconciliation of cash, cash equivalents, and restricted cash within the Condensed Consolidated Balance Sheets to the total shown in the Condensed Consolidated Statements of Cash Flows (in millions):
| As of March 31,
| 2026 |  | 2025
Cash and cash equivalents | $ | 201 |  |  | $ | 192 |
Restricted cash (included in Other noncurrent assets) | 3 |  |  | 3 |
Total cash, cash equivalents and restricted cash | $ | 204 |  |  | $ | 195 |
Restricted cash at March 31, 2026 and 2025 represents cash balances held as security in connection with our facility lease agreements.

X
- Definition Cash, cash equivalents and marketable securities. + References No definition available. + Details
Name: | rcus_CashCashEquivalentsAndMarketableSecuritiesAbstract
Namespace Prefix: | rcus_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure of cash, cash equivalent, and debt and equity securities, including realized and unrealized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent + Details
Name: | us-gaap_CashCashEquivalentsAndMarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration