Description of Business and Summary of Significant Accounting Policies | 1. Description of Business and Summary of Significant Accounting Policies CTI BioPharma Corp., together with its wholly-owned subsidiary, also referred to collectively in this Quarterly Report on Form 10-Q as “we,” “us,” “our,” the “Company” and “CTI,” is a biopharmaceutical company focused on the acquisition, development and commercialization of novel targeted therapies for blood-related cancers that offer a unique benefit to patients and their healthcare providers. Our goal is to build a profitable company by generating income from products we develop and commercialize, either alone or with partners. We concentrate our efforts on treatments that target blood-related cancers where there is an unmet medical need. In particular, we are focused on evaluating pacritinib, our sole product candidate currently in active development, for the treatment of adult patients with myelofibrosis. We operate in a highly regulated and competitive environment. The manufacturing and marketing of pharmaceutical products requires approval from, and is subject to, ongoing oversight by the Food and Drug Administration, or the FDA, in the U.S., the European Medicines Agency, or the EMA, in the European Union, or the E.U., and comparable agencies in other countries. Obtaining approval for a new therapeutic product is never certain, may take many years and may involve expenditure of substantial resources. Basis of Presentation The accompanying unaudited financial information as of and for the three and nine months ended September 30, 2019 and 2018 has been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information and with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, such financial information includes all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation of our financial position at such date and the operating results and cash flows for such periods. Operating results for the three and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the entire year or for any other subsequent interim period. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been omitted pursuant to the rules of the U.S. Securities and Exchange Commission, or the SEC. These unaudited financial statements and related notes should be read in conjunction with our audited financial statements for the year ended December 31, 2018 included in our Annual Report on Form 10-K filed with the SEC on March 13, 2019. The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by generally accepted accounting principles in the U.S. for complete financial statements. Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of CTI and its wholly-owned subsidiary, CTI Life Sciences Limited, or CTILS. As of September 30, 2019 , we also had an approximately 60% interest in our majority-owned subsidiary, Aequus Biopharma, Inc., or Aequus. The remaining interest in Aequus not held by CTI is reported as noncontrolling interest in the condensed consolidated financial statements. All intercompany transactions and balances are eliminated in consolidation. Liquidity The accompanying condensed consolidated financial statements have been prepared assuming that we will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business within one year after the date the condensed consolidated financial statements are issued. Our management evaluates whether there are conditions or events, considered in aggregate, that raise substantial doubt about our ability to continue as a going concern within one year after the date that the financial statements are issued. We will need to continue to conduct research, development, testing and regulatory compliance activities with respect to pacritinib and ensure the procurement of manufacturing and drug supply services, the costs of which, together with projected general and administrative expenses, is expected to result in operating losses for the foreseeable future. In October 2016, we resumed primary responsibility for the development and commercialization of pacritinib as a result of the termination of a Development, Commercialization and License Agreement, or the Pacritinib License Agreement, with Baxalta and are no longer eligible to receive cost sharing or milestone payments for pacritinib's development. We have incurred net operating losses every year since our formation. As of September 30, 2019 , we had an accumulated deficit of $2.3 billion , and we expect to continue to incur net losses for the foreseeable future. Our available cash, cash equivalents and short-term investments were $46.7 million as of September 30, 2019 , and we expect that our present financial resources will only be sufficient to meet our obligations as they come due and to fund our operations into the third quarter of 2020. Based on our evaluation completed pursuant to Accounting Standards Update No. 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern, these factors raise substantial doubt about our ability to continue as a going concern. Accordingly, we will need to acquire additional funds in order to develop our business and continue the development of pacritinib. We may seek to raise such capital through public or private equity financings, partnerships, collaborations, joint ventures, disposition of assets, debt financings or restructurings, bank borrowings or other sources of financing. However, we have a limited number of authorized shares of common stock available for issuance and additional funding obtained through the sale of such shares or otherwise may not be sufficient, available on favorable terms or at all. If additional funds are raised by issuing equity securities, substantial dilution to existing stockholders may result. If we fail to obtain additional capital when needed, our ability to operate as a going concern will be harmed, and we may be required to delay, scale back or eliminate some or all of our research and development programs, reduce our selling, general and administrative expenses, be unable to attract and retain highly-qualified personnel, be unable to obtain and maintain contracts necessary to continue our operations and at affordable rates with competitive terms, refrain from making our contractually required payments when due (including debt payments) and/or may be forced to cease operations, liquidate our assets and possibly seek bankruptcy protection. The amount of financing we require is dependent on many factors, such as the number of clinical trial sites, the number of patients in the trial, the pace of patient enrollment and other matters that may impact clinical development, including changes to the trial that we may initiate or that may be requested by the FDA or other regulators, and there can be no assurance as to the amount of funding necessary to fund the development of pacritinib to completion. In addition, our ability to comply with covenants under the loan and security agreement with Silicon Valley Bank, or SVB, may be affected by events beyond our control, and we may not be able to meet those covenants. A breach of any of these covenants, including a material adverse change in our business, operations or condition (financial or otherwise) could result in an event of default under the loan and security agreement, which could cause all of the outstanding indebtedness under the facility to become immediately due and payable. See Long-term Debt below for further discussion. The accompanying condensed consolidated financial statements do not include adjustments, if any, that may result from the outcome of this uncertainty. Cash, Cash Equivalents and Short-term Investments As of September 30, 2019 and December 31, 2018 , our cash, cash equivalents and short-term investments consisted of cash, money market funds, U.S. government and agency securities and corporate debt securities. Cash equivalents and short-term investments are recorded at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based on a three-tier hierarchy that prioritizes the inputs used to measure fair value. There are three levels of inputs used to measure fair value with Level 1 having the highest priority and Level 3 having the lowest: • Level 1—Valuations based on unadjusted quoted prices for identical assets and liabilities in active markets. • Level 2—Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. • Level 3—Valuations based on unobservable inputs that are supported by little or no market activity, reflecting our own assumptions. These valuations require significant judgment or estimation. We measure the fair value of money market funds based on the closing price reported by a fund sponsor from an actively traded exchange. We value all other securities using broker quotes that utilize observable market inputs. We did not hold cash, cash equivalents and short-term investments categorized as Level 3 assets as of September 30, 2019 and December 31, 2018 . The following table summarizes, by major security type, our cash, cash equivalents and short-term investments that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands): September 30, 2019 December 31, 2018 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Total Estimated Fair Value Total Estimated Fair Value Cash $ 801 $ — $ — $ 801 $ 919 Level 1 securities: Money market funds 31,624 — — 31,624 20,525 Level 2 securities: U.S. government and agency securities 8,786 2 — 8,788 15,213 Corporate debt securities 5,516 3 — 5,519 30,381 Total cash, cash equivalents and short-term investments $ 46,727 $ 5 $ — $ 46,732 $ 67,038 Receivables from License and Development Services Arrangements Our receivables relate to amounts payable or reimbursable to us under the terms of license and development services arrangements with our partners. The receivable balance as of September 30, 2019 primarily related to royalties from our partners Les Laboratoires Servier and Institut de Recherches Internationales Servier, or Servier. The receivable balance as of December 31, 2018 primarily related to a milestone receivable from Servier for the attainment of a regulatory milestone in November 2018 as well as a milestone receivable from Teva for the attainment of a worldwide net sales milestone of TRISENOX in December 2018. Receivables are reviewed for collectability whenever circumstances indicate that the carrying amount of the receivable may not be recoverable. We had no allowance for doubtful accounts from license and development services arrangements as of September 30, 2019 or December 31, 2018 . Italian Value Added Tax Receivable We historically carried out research and development activities in Italy and incurred value added tax, or VAT, from Italian suppliers on the acquisition of goods and services in Italy. This VAT should be considered as an input VAT credit. We treated the majority of our sales made in Italy without output VAT (on the basis that the supplies should be considered outside the scope of Italian VAT). This resulted in the value of input VAT exceeding the value of output VAT, and accordingly we submitted a refund claim for the VAT. The Italian Tax Authority, or the ITA, has challenged the treatment of the sales transactions and claimed that the sales transactions made by us should have been subject to output VAT. Our Italian VAT receivable was approximately $4.3 million and $4.5 million as of September 30, 2019 and December 31, 2018 , respectively. Substantially all of our VAT receivable is included in Other assets . As disclosed in Note 9. Contingencies , the ITA assessed us for additional VAT payments for services we provided in Italy, which we do not believe we owe. We have not recorded an amount in the financial statements for this contingent liability as we do not believe the potential payment of up to €4.2 million (or approximately $4.6 million converted using the currency exchange rate as of September 30, 2019 ) to the ITA is probable at this time. Leases As discussed in Recently Adopted Accounting Standards below, we adopted Accounting Standards Codification, or ASC, Topic 842 - Leases, on January 1, 2019. Under ASC 842, we determine if an arrangement is a lease at inception. We recognize a right-of-use asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases are classified as operating or finance at lease commencement, which will affect the pattern and classification of expense recognition in our condensed consolidated statements of operations. Right-of-use assets represent the right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As our leases do not provide a readily determinable implicit rate of return, we use our incremental borrowing rate to derive the present value of lease payments, which is the rate of interest that we would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. An operating lease right-of-use asset is measured at the amount of the lease liability, adjusted for prepaid or accrued lease payments, lease incentives received, unamortized initial direct costs and the impairment of the right-of-use asset. A lease may include options to extend or terminate the lease. When it is reasonably certain that we will exercise such an option, it is considered in the lease term. Right-of-use assets are tested for impairment in the same manner as long-lived assets used in operations. Leasehold improvements are capitalized at cost and amortized over the lesser of their expected useful life or the lease term. Lease expense for operating leases is recognized on a straight-line basis over the lease term as part of Research and development expenses and Selling, general and administrative expenses in our condensed consolidated statements of operations. The current portion of right-of-use assets and the non-current portion of right-of-use assets are included in Prepaid expenses and other current assets and Other assets , respectively, and the current portion of lease liabilities and the non-current portion of lease liabilities are included in Other current liabilities and Other liabilities , respectively, in our condensed consolidated balance sheets. Long-term Debt All amounts due under the loan and security agreement with SVB have been classified as a current liability as of September 30, 2019 due to the considerations discussed in Liquidity above and the assessment that the material adverse change clause under the loan and security agreement is not within our control. We have not been notified of an event of default by SVB as of the date of the filing of this Quarterly Report on Form 10-Q. Revenue Recognition We adopted ASC 606 - Revenue from Contracts with Customers , on January 1, 2018, using a modified retrospective method. This standard applies to all contracts with customers, except for contracts that are within the scope of other authoritative literature. Under ASC 606, we recognize revenue when a customer obtains control of promised goods or services, in an amount that reflects the consideration which we expect to be entitled in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, we perform the following five steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) we satisfy a performance obligation. We apply the five-step model to arrangements that meet the definition of a contract under ASC 606 including when it is probable that we will collect the consideration we are entitled to in exchange for goods or services we transfer to the customer. At contract inception, we assess the goods or services promised within each contract and determine those that are performance obligations, and assesses whether each promised good or service is distinct. We recognize revenue for the amount of the transaction price that is allocated to the respective performance obligation as the performance obligation is satisfied. License and Development Services Arrangements We recognize license and contract revenue under license and development services arrangements that are within the scope of ASC 606. The terms of these agreements may contain multiple performance obligations, which may include licenses and research and development activities. We evaluate these agreements under ASC 606 to determine distinct performance obligations. Prior to recognizing revenue, we make estimates of the transaction price, including any variable consideration that is subject to a constraint. Amounts of variable consideration are included in the transaction price to the extent that it is probable that there will not be a significant reversal in the amount of cumulative revenue recognized and when the uncertainty associated with the variable consideration is subsequently resolved. Variable consideration may include nonrefundable upfront license fees, payments for research and development activities, reimbursement of certain third-party costs, payments based upon the achievement of specified milestones, and royalty payments based on product sales derived from the arrangement. If there are multiple, distinct performance obligations, we allocate the transaction price to each distinct performance obligation based on its relative standalone selling price. Revenue is recognized by measuring the progress toward complete satisfaction of the performance obligations using an input measure in accordance with ASC-340-40, Other Assets and Deferred Costs: Contracts with Customers . Foreign Currency Translation and Transaction Gains and Losses We record foreign currency translation adjustments and transaction gains and losses in accordance with ASC 830 - Foreign Currency Matters. For our operations that have a functional currency other than the U.S. dollar, gains and losses resulting from the translation of the functional currency into U.S. dollars for financial statement presentation are not included in determining net loss, but are accumulated in the cumulative foreign currency translation adjustment account as a separate component of stockholders’ equity, except for intercompany transactions that are of a short-term nature with entities that are consolidated, combined or accounted for by the equity method in our condensed consolidated financial statements. We and our subsidiary also have transactions in foreign currencies other than the functional currency. We record transaction gains and losses in our condensed consolidated statements of operations related to the recurring measurement and settlement of such transactions. The intercompany balance due from CTILS is considered to be of a long-term nature. An unrealized foreign exchange loss of $1.4 million and $1.6 million for the three and nine months ended September 30, 2019 , respectively, and an unrealized foreign exchange loss of $0.2 million and $0.3 million for the same periods in 2018 were recorded in the cumulative foreign currency translation adjustment account. As of September 30, 2019 and December 31, 2018 , the intercompany balance due from CTILS was €29.8 million (or $32.5 million upon conversion from euros as of September 30, 2019 ) and €28.7 million (or $32.8 million upon conversion from euros as of December 31, 2018 ), respectively. As discussed in Note 8. Other Comprehensive Loss , we anticipate the dissolution of CTILS in the fourth quarter of 2019, and the intercompany balance due from CTILS is expected to be treated as capital contribution in connection with the dissolution. See Note 8. Other Comprehensive Loss for further discussion. Net Loss per Share Basic net loss per share is calculated based on the net loss attributable to common stockholders divided by the weighted average number of our common shares outstanding for the period. Diluted net income per share assumes the conversion of all dilutive convertible securities using the if-converted method and assumes the exercise or vesting of other dilutive securities, such as warrants and stock awards, using the treasury stock method. In periods when we have a net loss, stock awards, warrants and convertible securities are excluded from our calculation of net loss per share as their inclusion would have an anti-dilutive effect. Common shares underlying stock awards, warrants and convertible preferred stock aggregating 19.8 million shares and 18.5 million shares for the three and nine months ended September 30, 2019 , respectively, and 16.7 million shares and 14.8 million shares for the same periods in 2018 , respectively, were excluded from the calculation of diluted net loss per share because they were anti-dilutive. Recently Adopted Accounting Standards In February 2016, the FASB issued ASC 842 - Leases , which requires lessees to recognize virtually all of their leases (other than leases that meet the definition of a short-term lease) on the balance sheet. On January 1, 2019, we adopted ASC 842 using the modified retrospective approach with a cumulative-effect adjustment as of January 1, 2019 in accordance with ASU No. 2018-11, Leases (Topic 842) - Targeted Improvements . Prior period amounts are not adjusted and continue to be reported under previous lease guidance, ASC 840 - Leases . We have performed an evaluation of our contracts with customers and suppliers in accordance with ASC 842 and have determined that the agreements for our office space, parking and office equipment contained a lease. All identified leases are classified as operating leases. We had no finance or capital leases as of September 30, 2019 and December 31, 2018 and for the three and nine months ended September 30, 2019 and 2018 . We also elected a package of practical expedients permitted under the transition guidance within the new standard. The impact of the adoption of ASC 842 on our condensed consolidated balance sheet as of January 1, 2019 was as follows (in thousands): December 31, 2018 Adjustments due to adoption of ASC 842 January 1, 2019 Right-of-use assets, current $ — $ 1,034 $ 1,034 Right-of-use assets, non-current $ — $ 3,174 $ 3,174 Lease liabilities, current $ — $ 1,687 $ 1,687 Lease liabilities, non-current $ — $ 4,946 $ 4,946 Deferred rent, current $ 893 $ (893 ) $ — Deferred rent, non-current $ 2,157 $ (2,157 ) $ — Accumulated deficit $ (2,224,746 ) $ 1,196 $ (2,223,550 ) The adoption of the standard did not materially impact our condensed consolidated statements of operations or condensed consolidated statements of cash flows. See Note 4. Leases for further details about our leases. In June 2018, the FASB issued new accounting guidance which simplifies the accounting for share-based payments granted to nonemployees for goods and services by aligning it with the accounting for share-based payments to employees, with certain exceptions. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We adopted this guidance on January 1, 2019. The adoption of this accounting guidance did not have a material impact on our condensed consolidated financial statements. Recently Issued Accounting Standards In June 2016, the FASB issued new accounting guidance which amends the impairment model for most financial assets and certain other instruments. For trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, the standard requires the use of a new forward-looking "expected credit loss" model that generally will result in the earlier recognition of allowances for losses. For available-for-sale debt securities with unrealized losses, the standard now requires allowances to be recorded instead of reducing the amortized cost of the investment. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We do not expect the adoption of this accounting guidance to have a material impact on our condensed consolidated financial statements. In August 2018, the FASB issued new accounting guidance which eliminates certain disclosure requirements for fair value measurements for all entities, requires public entities to disclose certain new information and modifies some disclosure requirements. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for either the entire standard or any eliminated or modified disclosures. We do not expect the adoption of this accounting guidance to have a material impact on our condensed consolidated financial statements. Although there were several other new accounting pronouncements issued or proposed by the FASB, we do not believe any of these have had or will have material impact on our condensed consolidated financial statements. Reclassifications Certain prior year items have been reclassified to conform to current year presentation. |