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Licensing and Other Arrangements - Novartis (Details) $ / shares in Units, $ in Thousands, € in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 24, 2017 EUR (€) agreement item shares | Aug. 24, 2017 USD ($) agreement item $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Licensing and other arrangements |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 21,929 | $ 6,063 |
Issuance of common stock, fair value |  |  | 21,762 | 5,866 |
Revenue from contracts with customers |  |  | $ 17,276 | $ 5,068 |
Common Stock |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Issuance of common stock, net (in shares) | shares |  |  | 1,000,000 | 354,000 |
Issuance of common stock, fair value |  |  | $ 8 | $ 2 |
XOMA-052 License Agreement | Common Stock |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares |  | $ 8.93 |  |  |
Novartis Pharma AG |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Common stock premium |  | $ 200 |  |  |
Novartis Pharma AG | XOMA052 License Agreement and I L1 Target License Agreement |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Upfront payment received |  | 25,700 |  |  |
License agreement consideration received, repayment of debt |  | $ 14,300 |  |  |
Number of license agreements | agreement | 2 | 2 |  |  |
Number of arrangements | item | 1 | 1 |  |  |
Remaining performance obligations |  | $ 0 |  |  |
Number of performance obligations | item | 2 | 2 |  |  |
Transaction price |  | $ 40,200 |  |  |
Revenue from contracts with customers |  |  | 0 | 0 | $ 40,200
Contract assets |  |  | 0 | 0 |
Contract liabilities |  |  | 0 | 0 |
Capitalized contract costs |  |  | $ 0 | $ 0 |
Novartis Pharma AG | XOMA-052 License Agreement |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
License agreement consideration received |  | 30,000 |  |  |
Upfront payment received |  | 15,700 |  |  |
License agreement consideration received, repayment of debt | € 12.0 | 14,300 |  |  |
Proceeds from issuance of common stock |  | 5,000 |  |  |
Common stock premium |  | 200 |  |  |
Maximum eligible milestone payments receivable upon achievement of development, regulatory and commercial milestones |  | $ 438,000 |  |  |
Agreement termination prior written notice period | 6 months | 6 months |  |  |
Novartis Pharma AG | XOMA-052 License Agreement | Common Stock |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Issuance of common stock, net (in shares) | shares | 539,131 | 539,131 |  |  |
Purchase price (in dollars per share) | $ / shares |  | $ 9.2742 |  |  |
Issuance of common stock, fair value |  | $ 4,800 |  |  |
Novartis Pharma AG | IL-1 Target License Agreement |  |  |  |  |
Licensing and other arrangements |  |  |  |  |
Upfront payment received |  | $ 10,000 |  |  |

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