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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net loss | $ (8,291) | $ (839) |
Adjustments to reconcile net loss to net cash (used in) provided by operating activities |  |  |
Stock-based compensation expense | 2,561 | 2,739 |
Common stock contribution to 401(k) | 88 | 102 |
Depreciation and amortization | 12 | 12 |
Amortization of debt issuance costs, debt discount and final payment on debt | 374 | 234 |
Provision for bad debt | 1,409 |  |
Non-cash lease expense | 74 | 976 |
Change in fair value of equity securities | 150 | (746) |
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | 1,113 | (1,151) |
Income tax receivable | (1,526) |  |
Prepaid expenses and other assets | (497) | (368) |
Accounts payable and accrued liabilities | (152) | 193 |
Unearned revenue recognized under units-of-revenue method | (695) | (442) |
Operating lease liabilities | (79) | (1,073) |
Other liabilities | 309 | 427 |
Net cash (used in) provided by operating activities | (5,150) | 64 |
Cash flows from investing activities: |  |  |
Payments related to purchase of royalty rights |  | (6,300) |
Net cash used in investing activities |  | (6,300) |
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 26 | 17 |
Proceeds from exercise of options | 25 | 257 |
Proceeds from issuance of long-term debt |  | 3,000 |
Payment of stock issuance costs | (211) | (377) |
Principal payments - debt | (1,875) |  |
Principal payments - finance lease | (9) | (7) |
Proceeds from disgorgement of stockholder's short-swing profits | 13 |  |
Taxes paid related to net share settlement of equity awards | (16) | (107) |
Net cash (used in) provided by financing activities | (2,047) | 2,783 |
Net decrease in cash | (7,197) | (3,453) |
Cash at the beginning of the period | 56,688 | 45,780 | $ 45,780
Cash at the end of the period | 49,491 | 42,327 | $ 56,688
Supplemental Cash Flow Information: |  |  |
Cash paid for interest | 379 | 217 |
Non-cash investing and financing activities: |  |  |
Interest added to principal balance on long-term debt | 317 | 376 |
Accrued cost related to issuance of stock | $ 19 |  |
Issuance of common stock warrant under SVB loan |  | 66 |
Estimated fair value of contingent consideration under the royalty purchase agreements |  | $ 3,075 |

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- Definition Accrued cost related to issuance of preferred and common stock. + References No definition available. + Details
Name: | xoma_AccruedCostRelatedToIssuanceOfPreferredAndCommonStock
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined contribution plan issuance of Common stock for services or claims. + References No definition available. + Details
Name: | xoma_DefinedContributionPlanIssuanceOfCommonStockForServicesOrClaims
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated fair value of contingent consideration under royalty purchase agreements. + References No definition available. + Details
Name: | xoma_EstimatedFairValueOfContingentConsiderationUnderRoyaltyPurchaseAgreements
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate amount of lease liabilities that result from activities that generate operating income. + References No definition available. + Details
Name: | xoma_IncreaseDecreaseInOperatingLeaseLiabilities
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unpaid interest added to the outstanding principal amount on long-term debt. + References No definition available. + Details
Name: | xoma_InterestAddedPrincipalBalancesLongTermDebt
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Operating lease payments, non cash. + References No definition available. + Details
Name: | xoma_OperatingLeasePaymentsNonCash
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments related to purchase of royalty rights. + References No definition available. + Details
Name: | xoma_PaymentsRelatedToPurchaseOfRoyaltyRights
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from disgorgement. + References No definition available. + Details
Name: | xoma_ProceedsFromRepaymentsForDisgorgement
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration