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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenues: |  |
Revenue from contracts with customers | $ 5,068 | $ 52,428
Revenue recognized under units-of-revenue method | 231 | 262
Total revenues | 5,299 | 52,690
Operating expenses: |  |
Research and development | 1,682 | 7,875
General and administrative | 18,563 | 24,337
Restructuring charges | 1,911 | 3,447
Total operating expenses | 22,156 | 35,659
(Loss) income from operations | (16,857) | 17,031
Other income (expense): |  |
Interest expense | (922) | (1,238)
Loss on extinguishment of debt |  | (650)
Other income, net | 4,338 | 1,115
(Loss) income before income tax | (13,441) | 16,258
Income tax benefit (expense) | 98 | (1,662)
Net (loss) income and comprehensive (loss) income | (13,343) | 14,596
Net (loss) income and comprehensive (loss) income available to common stockholders, basic | (13,343) | 5,714
Net (loss) income and comprehensive (loss) income available to common stockholders, diluted | $ (13,343) | $ 5,810
Basic net (loss) income per share available to common stockholders | $ (1.59) | $ 0.75
Diluted net (loss) income per share available to common stockholders | $ (1.59) | $ 0.73
Weighted average shares used in computing basic net (loss) income per share available to common stockholders | 8,373 | 7,619
Weighted average shares used in computing diluted net (loss) income per share available to common stockholders | 8,373 | 7,980

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- Definition Revenue recognize under units of revenue method. + References No definition available. + Details
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Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration