Clovis Oncology (CLVSQ) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	CLVS
Entity Registrant Name	Clovis Oncology, Inc.
Entity Central Index Key	1,466,301
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		52,548,995

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Product revenue	$ 18,523	$ 7,045
Operating expenses:
Cost of sales	4,006
Research and development	43,543	32,447
Selling, general and administrative	39,274	29,224
Total expenses	87,195	63,206
Operating loss	(68,672)	(56,161)
Other income (expense):
Interest expense	(2,635)	(2,581)
Foreign currency loss	(81)	(159)
Legal settlement loss	(7,975)
Other income	1,409	354
Other expense, net	(9,282)	(2,386)
Loss before income taxes	(77,954)	(58,547)
Income tax benefit	260	83
Net loss	(77,694)	(58,464)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	1,517	467
Net unrealized loss on available-for-sale securities, net of tax	(5)	(5)
Other comprehensive income:	1,512	462
Comprehensive loss	$ (76,182)	$ (58,002)
Loss per basic and diluted common share:
Basic and diluted net loss per common share	$ (1.54)	$ (1.33)
Basic and diluted weighted average common shares outstanding	50,602	44,039
Intangible asset amortization
Operating expenses:
Cost of sales	$ 372	$ 372
Product
Operating expenses:
Cost of sales	$ 4,006	$ 1,163

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 374,114	$ 464,198
Accounts receivable, net	12,936	6,181
Inventories	69,192	27,508
Available-for-sale securities	89,697	99,533
Prepaid research and development expenses	4,619	1,559
Deposit on inventory		20,461
Other current assets	9,115	7,500
Total current assets	559,673	626,940
Deposit on inventory	9,303
Property and equipment, net	3,938	4,007
Intangible assets, net	19,189	19,561
Goodwill	66,960	65,217
Other assets	19,861	19,505
Total assets	678,924	735,230
Current liabilities:
Accounts payable	13,378	15,147
Accrued research and development expenses	22,224	18,465
Milestone liability	22,534	22,022
Other accrued expenses	27,306	25,883
Total current liabilities	85,442	81,517
Deferred income taxes	371
Convertible senior notes	282,732	282,406
Deferred rent, long-term	4,143	3,671
Total liabilities	372,688	367,594
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized, no shares issued and outstanding at March 31, 2018 and December 31, 2017
Common stock, $0.001 par value per share, 100,000,000 shares authorized at March 31, 2018 and December 31, 2017; 50,697,471 and 50,565,119 shares issued and outstanding at March 31, 2018 and December 31, 2017 respectively	51	51
Additional paid-in capital	1,899,624	1,887,198
Accumulated other comprehensive loss	(40,661)	(42,173)
Accumulated deficit	(1,552,778)	(1,477,440)
Total stockholders' equity	306,236	367,636
Total liabilities and stockholders' equity	$ 678,924	$ 735,230

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,697,471	50,565,119
Common stock, shares outstanding	50,697,471	50,565,119

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net loss	$ (77,694)	$ (58,464)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	11,913	8,947
Depreciation and amortization	586	639
Amortization of premiums and discounts on available-for-sale securities	(171)	214
Amortization of debt issuance costs	326	317
Deferred income taxes	(101)	(60)
Changes in operating assets and liabilities:
Accounts receivable	(3,418)	(2,257)
Inventory	(41,716)	(6,504)
Prepaid and accrued research and development expenses	637	(10,047)
Deposit on inventory	11,157	(18,237)
Other operating assets	(1,890)	1,223
Accounts payable	(1,730)	13,780
Other accrued expenses	1,466	(9,990)
Net cash used in operating activities	(100,635)	(80,439)
Investing activities
Purchases of property and equipment	(217)	(53)
Deposits for purchases of property and equipment		(2,515)
Purchases of available-for-sale securities		(133,000)
Sales of available-for-sale securities	10,000	50,000
Acquired in-process research and development - milestone payment		(1,100)
Net cash provided by (used in) investing activities	9,783	(86,668)
Financing activities
Proceeds from the sale of common stock, net of issuance costs		221,224
Proceeds from the exercise of stock options and employee stock purchases	514	5,674
Net cash provided by financing activities	514	226,898
Effect of exchange rate changes on cash and cash equivalents	254	72
Increase (decrease) in cash and cash equivalents	(90,084)	59,863
Cash and cash equivalents at beginning of period	464,198	216,186
Cash and cash equivalents at end of period	374,114	276,049
Supplemental disclosure of cash flow information:
Cash paid for interest	3,594	3,594
Non-cash investing and financing activities:
Vesting of restricted stock units	$ 6,409	$ 2,534

Nature of Business and Basis of

Nature of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Nature of Business and Basis of Presentation
Nature of Business and Basis of Presentation	1. Nature of Business and Basis of Presentation Clovis Oncology, Inc. (together with its consolidated subsidiaries, the “Company”, “Clovis”, “we”, “our”, “us”) is a biopharmaceutical company focused on acquiring, developing and commercializing innovative anti-cancer agents in the United States, Europe and additional international markets. We target our development programs for the treatment of specific subsets of cancer populations, and simultaneously develop, with partners, diagnostic tools intended to direct a compound in development to the population that is most likely to benefit from its use. We have and intend to continue to license or acquire rights to oncology compounds in all stages of clinical development. In exchange for the right to develop and commercialize these compounds, we generally expect to provide the licensor with a combination of upfront payments, milestone payments and royalties on future sales. In addition, we generally expect to assume the responsibility for future drug development and commercialization costs. We currently operate in one segment. Since inception, our operations have consisted primarily of developing in-licensed compounds, evaluating new product acquisition candidates and general corporate activities. Our marketed product Rubraca® (rucaparib) is approved in the United States by the Food and Drug Administration (“FDA”) for the treatment of adult patients with deleterious BRCA (human genes associated with the repair of damaged DNA) mutation (germline and/or somatic) epithelial ovarian, fallopian tube, or primary peritoneal cancer who have been treated with two or more chemotherapies, and selected for therapy based on an FDA-approved companion diagnostic for Rubraca. We launched Rubraca in the United States in December 2016. On April 6, 2018, the FDA approved Rubraca for the maintenance treatment of adult patients with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in a complete or partial response to platinum-based chemotherapy. The FDA granted regular approval for Rubraca in this second, broader and earlier-line indication on a priority review timeline based on positive data from the phase 3 ARIEL3 clinical trial. Diagnostic testing is not required for patients to be prescribed Rubraca in this maintenance treatment indication. In March 2018, the Committee for Medicinal Products for Human Use (“CHMP”) of the European Union’s European Medicines Agency (“EMA”) adopted a positive opinion recommending the granting of a conditional marketing authorization for Rubraca as monotherapy treatment of adult patients with platinum sensitive, relapsed or progressive, BRCA mutated (germline and/or somatic), high-grade epithelial ovarian, fallopian tube, or primary peritoneal cancer, who have been treated with two or more prior lines of platinum based chemotherapy, and who are unable to tolerate further platinum based chemotherapy. We anticipate receiving a formal marketing authorization from the European Commission for Rubraca for this indication in the second quarter of 2018. As this is a conditional approval, it will be necessary to complete confirmatory post marketing commitments, including ensuring that sufficient partially platinum sensitive patients are enrolled in our ARIEL4 confirmatory trial to support the indication. This may require enrollment of additional patients into the study, increasing its overall size and extending the time for enrollment. In the event of such an approval from the European Commission for this treatment indication, we intend to submit to the EMA a variation to the marketing authorization for the maintenance treatment of adult patients with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in a complete or partial response to platinum-based chemotherapy, for which we anticipate a CHMP opinion may come during the fourth quarter of 2018. In addition to Rubraca, we have two other product candidates: lucitanib, an oral, potent inhibitor of the tyrosine kinase activity of vascular endothelial growth factor receptors 1 through 3 (VEGFR1-3), platelet-derived growth factor receptors alpha and beta (PDGFR α/β) and fibroblast growth factor receptors 1 through 3 (FGFR1-3), and rociletinib, an oral mutant-selective inhibitor of epidermal growth factor receptor (“EGFR”). While we have stopped enrollment in ongoing trials for each of these candidates, we continue to provide drug to patients whose clinicians recommend continuing therapy. We maintain certain development and commercialization rights for lucitanib and global development and commercialization rights for rociletinib. Lucitanib was originally developed by Clovis and Servier with the hypothesis of activity in FGFR driven tumors; however, data in breast and lung cancer were insufficient to move the program forward. We have received notice from Servier of termination of their rights to lucitanib, resulting in the return of global rights (excluding China) for lucitanib to us later in 2018. We believe that recent data for a drug similar to lucitanib that inhibits these same pathways – when combined with a PD-1 inhibitor – provide support for development of lucitanib in combination with a PD(L)-1 inhibitor, and we are exploring a study of the combination. We also intend to initiate a study of lucitanib in combination with Rubraca, based on encouraging data of VEGF and PARP inhibitors in combination. Each of these studies is expected to initiate by the end of 2018 or in the first quarter of 2019. Basis of Presentation All financial information presented includes the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The unaudited financial statements of Clovis Oncology, Inc. included herein reflect all adjustments, consisting only of normal recurring adjustments that, in the opinion of management, are necessary to fairly state our financial position, results of operations and cash flows for the periods presented herein. Interim results may not be indicative of the results that may be expected for the full year. Certain information and footnote disclosures normally included in audited financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto which are included in our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”) for a broader discussion of our business and the opportunities and risks inherent in such business. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, expenses and revenue and related disclosures. On an ongoing basis, we evaluate our estimates, including estimates related to revenue deductions, intangible asset impairment, clinical trial accruals and share-based compensation expense. We base our estimates on historical experience and other market-specific or other relevant assumptions that we believe to be reasonable under the circumstances. Actual results may differ from those estimates or assumptions. Liquidity We have incurred significant net losses since inception and have relied on our ability to fund our operations through debt and equity financings. We expect operating losses and negative cash flows to continue for the foreseeable future. As we continue to incur losses, transition to profitability is dependent upon achieving a level of revenues from Rubraca adequate to support our cost structure. We may never achieve profitability, and unless or until we do, we will continue to need to raise additional cash. In April 2018, we sold 1,837,898 shares of our common stock in a public offering at $54.41 per share. The net proceeds from the offering were approximately $94 million, after deducting underwriting discounts and commissions and offering expenses. Concurrently, we completed the public offering of $300.0 million aggregate principal amount of 1.25% convertible senior notes due 2025. The net proceeds from this offering were approximately $292 million, after deducting underwriting discounts and commissions and offering expenses. We intend to use the net proceeds of the offerings for general corporate purposes, including sales and marketing expenses associated with Rubraca in the United States and, if approved by the European Commission, in Europe, funding of our development programs, general and administrative expenses, acquisition or licensing of additional product candidates or businesses and working capital. Based on current estimates, we believe that our existing cash, cash equivalents and available-for-sale securities will allow us to fund our operating plan through at least the next 12 months.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Recently Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-09, “Revenue from Contracts with Customers”, and has subsequently issued several supplemental and/or clarifying ASUs (collectively, “ASC 606”). ASC 606 prescribes a single common revenue standard that replaces most existing U.S. GAAP revenue recognition guidance. ASC 606 is intended to provide a more consistent interpretation and application of the principles outlined in the standard across filers in multiple industries and within the same industries compared to current practices, which should improve comparability. Adoption of ASC 606 is required for annual and interim periods beginning after December 15, 2017. Upon adoption, we must elect to adopt either retrospectively to each prior reporting period presented or use the modified retrospective transition method with the cumulative effect of initial adoption recognized at the date of initial application. We adopted the new standard using the modified retrospective method on January 1, 2018 for contracts that are not completed as of the adoption date. Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the entity performs 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) the entity satisfies a performance obligation. ASC 606 also impacts certain other areas, such as the accounting for costs to obtain or fulfill a contract. The standard also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We have examined our revenue recognition policy specific to revenue streams from representative contracts governing product sales from Rubraca and have come to conclusions on the impact of the new standard using the 5-step process prescribed by ASC 606. We have reviewed a representative sample of contracts, including our collaboration agreements with Servier and Bristol-Myers Squibb, and determined the potential impact to our accounting policies, financial controls and operations. Our conclusions include recognizing revenue on product sales once the product is sold to the specialty distributor and specialty pharmacy providers. As noted above, we used the modified retrospective method to adopt the new standard. This means that we did not restate previously issued financial statements, but we recorded a one-time adjustment to retained earnings of $2.4 million. This adjustment represents the sales of our product to our customers prior to January 1, 2018, that have not been sold to patients or healthcare providers, offset by related gross-to-net adjustments and other direct costs, including royalties and sales incentive compensation. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance at Adjustments due to Balance at December 31, 2017 Adoption of ASC 606 January 1, 2018 ASSETS Accounts receivable, net $ 6,181 $ 3,336 $ 9,517 Inventories $ 27,508 (62) $ 27,446 Total assets $ 735,230 $ 3,274 $ 738,504 LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 25,883 $ 918 $ 26,801 Accumulated deficit $ (1,477,440) 2,356 $ (1,475,084) Total liabilities and stockholders' equity $ 735,230 $ 3,274 $ 738,504 Previously, we recognized revenue on product sales once the product was sold to the patient or healthcare provider by the specialty distributor or specialty pharmacy provider, i.e. when product is sold through the channel. Effective January 1, 2018, we began recognizing revenue when our customers, the specialty distributors and specialty pharmacy providers, take control of our product or when product is sold into the channel. This will have the impact of us recognizing revenue approximately two to four weeks earlier than before adopting the new standard and will also increase the significance of estimating variable consideration. The impact of adoption on our consolidated statement of operations and comprehensive loss and consolidated balance sheet for the quarter ended March 31, 2018 was as follows (in thousands, except per share amounts): Balances without Effect of Change As reported Adoption of ASC 606 Higher/(Lower) CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS Product revenue $ 18,523 $ 17,956 $ 567 Cost of sales - product $ 4,006 $ 3,541 $ 465 Selling, general and administrative $ 39,274 $ 39,234 $ 40 Net loss $ (77,694) $ (77,756) $ (62) Loss per basic and diluted common share: Basic and diluted net loss per common share $ (1.54) $ (1.54) $ (0.00) CONSOLIDATED BALANCE SHEET ASSETS Accounts receivable, net $ 12,936 $ 12,322 $ 614 Inventories $ 69,192 $ 69,559 $ (367) LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 27,306 $ 27,120 $ 186 Accumulated deficit $ (1,552,778) $ (1,552,840) $ (62) ASC 606 did not have an aggregate impact on our net cash provided by operating activities, but resulted in offsetting changes in certain assets and liabilities presented within net cash used in operating activities in our consolidated statement of cash flows, as reflected in the above tables. In May 2017, the FASB issued ASU 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting”, which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which we would be required to apply modification accounting under ASC 718. Specifically, we would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. The guidance is effective for us on January 1, 2018 and the adoption resulted in no change to our consolidated financial statements and related disclosures. Recently Issued Accounting Standards From time to time, the FASB or other standards setting bodies issue new accounting pronouncements. Updates to the FASB Accounting Standards Codification (“ASC”) are communicated through issuance of an ASU. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”, which requires lessees to recognize assets and liabilities for the rights and obligations created by most leases on their balance sheet. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. ASU 2016-02 requires modified retrospective adoption for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. We are currently evaluating the impact the standard may have on our consolidated financial statements and related disclosures. In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which allow a reclassification from accumulated other comprehensive income (loss) (“AOCI”) to retained earnings for stranded tax effects resulting from the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts at the date of enactment of the Tax Cuts and Jobs Act of 2017 (the “2017 Tax Act”). The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact the standard may have on our consolidated financial statements and related disclosures. Revenue Recognition We are currently approved to sell Rubraca in the United States market. We distribute our product principally through a limited number of specialty distributor and specialty pharmacy providers, collectively, our customers. Our customers subsequently sell our products to patients and health care providers. Separately, we have arrangements with certain payors and other third-parties that provide for government-mandated and privately-negotiated rebates, chargebacks and discounts. Product Revenue We are currently approved to sell Rubraca in the United States market. We distribute our product principally through a limited number of specialty distributor and specialty pharmacy providers, collectively, our customers. Our customers subsequently sell our products to patients and health care providers. Separately, we have arrangements with certain payors and other third-parties that provide for government-mandated and privately-negotiated rebates, chargebacks and discounts. Revenue from product sales are recognized when the performance obligation is satisfied, which is when customers obtain control of our product at a point in time, typically upon delivery. We expense incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have recognized is one year or less. Reserves for Variable Consideration Revenues from product sales are recorded at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are established and which result from rebates, chargebacks, discounts, co-pay assistance, estimated product returns and other allowances that are offered within contracts between us and our customers, health care providers, payors and other indirect customers relating to the sales of our product. These reserves are based on the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (if the amount is payable to the customers) or a current liability (if the amount is payable to a party other than a customer). Where appropriate, these estimates take into consideration a range of possible outcomes which are probability-weighted for relevant factors such as our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Overall, these reserves reflect our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration which is included in the transaction price may be constrained, and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of consideration ultimately received may differ from our estimates. If actual results in the future vary from our estimates, we adjust these estimates, which would affect product revenue and earnings in the period such variances become known. Rebates . Rebates include mandated discounts under the Medicaid Drug Rebate Program and the Medicare coverage gap program. Rebates are amounts owed after the final dispensing of products to a benefit plan participant and are based upon contractual agreements or legal requirements with the public-sector benefit providers. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue and the establishment of a current liability which is included in accrued expenses on the consolidated balance sheet. We estimate our Medicaid and Medicare rebates based upon a range of possible outcomes that are probability-weighted for the estimated payor mix. The accrual for rebates is based on statutory discount rates and known sales to specialty pharmacy patients, or expected utilization for specialty distributor sales to healthcare providers. As we gain more historical experience, the accrual will be based solely on the expected utilization from historical data we have accumulated since the Rubraca product launch. Rebates are generally invoiced and paid quarterly in arrears so that the accrual balance consists of an estimate of the amount expected to be incurred for the current quarter’s activity, plus an accrual balance for known or estimated prior quarters’ unpaid rebates. Chargebacks . Chargebacks are discounts that occur when contracted customers, which currently consist primarily of group purchasing organizations, Public Health Service organizations and federal government entities purchasing via the Federal Supply Schedule, purchase directly from our specialty distributors at a discounted price. The specialty distributor, in turn, charges back the difference between the price initially paid by the specialty distributor and the discounted price paid to the specialty distributor by the healthcare provider. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. The accrual for specialty distributor chargebacks is estimated based on known chargeback rates and known sales to specialty distributors adjusted for the estimated utilization by healthcare providers. Discounts and Fees . Our payment terms are approximately 30 days. Specialty distributors and specialty pharmacies are offered various forms of consideration, including service fees and prompt pay discounts for payment within a specified period. We expect these customers will earn prompt pay discounts and therefore, we deduct the full amount of these discounts and service fees from product sales when revenue is recognized. Co-pay assistance . Patients who have commercial insurance and meet certain eligibility requirements may receive co-pay assistance. The intent of this program is to reduce the patient’s out of pocket costs. Liabilities for co-pay assistance are based on actual program participation provided by third-party administrators at month end. Returns . Consistent with industry practice, we generally offer customers a right of return limited only to product that will expire in six months or product that is six months beyond the expiration date. To date, we have had minimal product returns and we currently do not have an accrual for product returns. We will continue to assess our estimate for product returns as we gain additional historical experience. Cost of Sales – Product Product cost of sales consists primarily of materials, third-party manufacturing costs as well as freight and royalties owed to our licensing partners for Rubraca sales. Cost of Sales – Intangible Asset Amortization Cost of sales for intangible asset amortization consists of the amortization of capitalized milestone payments made to our licensing partners upon FDA approval of Rubraca. Milestone payments are amortized on a straight-line basis over the estimated remaining patent life of Rubraca. Inventory Inventories are stated at the lower of cost or estimated net realizable value, on a first-in, first-out (“FIFO”) basis. We began capitalizing incurred inventory related costs upon the regulatory approval of Rubraca. Prior to the regulatory approval of Rubraca, we incurred costs for the manufacture of the drug that could potentially be available to support the commercial launch of Rubraca and all such costs were recognized as research and development expense. We periodically analyze our inventory levels, and write down inventory that has become obsolete, inventory that has a cost basis in excess of its estimated realizable value and/or inventory in excess of expected sales requirements as cost of product revenues. Expired inventory would be disposed of and the related costs would be written off as cost of product revenues. The active pharmaceutical ingredient (“API”) in Rubraca is currently produced by a single supplier. As the API has undergone significant manufacturing specific to its intended purpose at the point it is purchased by us, we classify the API as work-in-process inventory. Our other significant accounting policies are described in Note 2, Summary of Significant Accounting Policies of the Notes to the Consolidated Financial Statements included in our 2017 Form 10-K.

Financial Instruments and Fair

Financial Instruments and Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Financial Instruments and Fair Value Measurements
Financial Instruments and Fair Value Measurements	3. Financial Instruments and Fair Value Measurements Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (at exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The three levels of inputs that may be used to measure fair value include: Level 1: Quoted prices in active markets for identical assets or liabilities. Our Level 1 assets consist of money market investments. We do not have Level 1 liabilities. Level 2: Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities in active markets or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Our Level 2 assets consist of U.S. treasury securities. We do not have Level 2 liabilities. Level 3: Unobservable inputs that are supported by little or no market activity. We do not have Level 3 assets or liabilities that are measured at fair value on a recurring basis. The following table identifies our assets and liabilities that were measured at fair value on a recurring basis (in thousands): Balance Level 1 Level 2 Level 3 March 31, 2018 Assets: Money market $ 294,559 $ 294,559 $ — $ — U.S. treasury securities 89,697 — 89,697 — Total assets at fair value $ 384,256 $ 294,559 $ 89,697 $ — December 31, 2017 Assets: Money market $ 433,136 $ 433,136 $ — $ — U.S. treasury securities 99,533 — 99,533 — Total assets at fair value $ 532,669 $ 433,136 $ 99,533 $ — There were no transfers between the Level 1 and Level 2 categories or into or out of the Level 3 category during the three months ended March 31, 2018. Financial instruments not recorded at fair value include our convertible senior notes. At March 31, 2018, the carrying amount of the convertible senior notes was $282.7 million, which represents the aggregate principal amount net of remaining debt issuance costs, and the fair value was $335.5 million. The fair value was determined using Level 2 inputs based on the indicative pricing published by certain investment banks or trading levels of these notes, which are not listed on any securities exchange or quoted on an inter-dealer automated quotation system. See Note 9, Convertible Senior Notes for discussion of the convertible senior notes.

Available-for-Sale Securities

Available-for-Sale Securities	3 Months Ended
	Mar. 31, 2018
Available-for-Sale Securities
Available-for-Sale Securities	4. Available-for-Sale Securities As of March 31, 2018, available-for-sale securities consisted of the following (in thousands): Gross Gross Aggregate Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. treasury securities $ 89,821 $ — $ (124) $ 89,697 As of December 31, 2017, available-for-sale securities consisted of the following (in thousands): Gross Gross Aggregate Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. treasury securities $ 99,650 $ — $ (117) $ 99,533 As of March 31, 2018, there were no available-for-sale securities that have been in a continuous unrealized loss position for less than 12 months. As of March 31, 2018, the amortized cost and fair value of available-for-sale securities by contractual maturity were (in thousands): Amortized Fair Cost Value Due in one year or less $ 89,821 $ 89,697 Due in one year to two years — — Total $ 89,821 $ 89,697

Inventories

Inventories	3 Months Ended
	Mar. 31, 2018
Inventories
Inventories	5. Inventories The following table presents inventories as of March 31, 2018 and December 31, 2017: March 31, December 31, 2018 2017 Work-in-process $ 67,437 $ 24,721 Finished goods 1,755 2,787 Total inventories $ 69,192 $ 27,508 Some of the costs related to our finished goods on-hand as of March 31, 2018 were expensed as incurred prior to the commercialization of Rubraca on December 19, 2016. At March 31, 2018, deposit on inventory on the Consolidated Balance Sheets is a cash deposit of $9.3 million made to a manufacturer for the purchase of work-in-process inventory which we expect to be converted to finished goods beyond the next twelve months.

Other Current Assets

Other Current Assets	3 Months Ended
	Mar. 31, 2018
Other Current Assets
Other Current Assets	6. Other Current Assets Other current assets were comprised of the following (in thousands): March 31, December 31, 2018 2017 Prepaid insurance $ 1,427 $ 1,926 Prepaid expenses - other 5,684 3,355 Receivable - other 1,780 2,023 Other 224 196 Total $ 9,115 $ 7,500

Intangible Assets and Goodwill

Intangible Assets and Goodwill	3 Months Ended
	Mar. 31, 2018
Intangible Assets and Goodwill
Intangible Assets and Goodwill	7. Intangible Assets and Goodwill Intangible assets related to capitalized milestones under license agreements consisted of the following (in thousands): March 31, December 31, 2018 2017 Intangible asset - milestones $ 21,100 $ 21,100 Accumulated amortization (1,911) (1,539) Total intangible asset, net $ 19,189 $ 19,561 The estimated useful lives of these intangible assets are based on the estimated remaining patent life of Rubraca and extend through 2031. We recorded amortization expense of $0.4 million and $0.4 million related to capitalized milestone payments during the three months ended March 31, 2018 and March 31, 2017, respectively, included in cost of sales – intangible asset amortization on the Consolidated Statements of Operations and Comprehensive Loss. Estimated future amortization expense associated with intangibles is expected to be as follows (in thousands): 2018 $ 1,114 2019 1,486 2020 1,486 2021 1,486 2022 1,486 Thereafter 12,131 $ 19,189 The change in goodwill established as part of the purchase accounting of EOS in November 2013 consisted of the following (in thousands): Balance at December 31, 2017 $ 65,217 Change in foreign currency gains and losses 1,743 Balance at March 31, 2018 $ 66,960

Other Accrued Expenses

Other Accrued Expenses	3 Months Ended
	Mar. 31, 2018
Other Accrued Expenses
Other Accrued Expenses	8. Other Accrued Expenses Other accrued expenses were comprised of the following (in thousands): March 31, December 31, 2018 2017 Accrued personnel costs $ 7,381 $ 13,889 Accrued interest payable 299 2,096 Income tax payable 45 — Accrued corporate legal fees and professional services 137 415 Accrued royalties 4,025 2,984 Accrued variable considerations 1,391 1,008 Payable to third party logistics provider 2,661 2,661 Accrued legal settlement cost 7,975 — Accrued expenses - other 3,392 2,830 Total $ 27,306 $ 25,883

Convertible Senior Notes

Convertible Senior Notes	3 Months Ended
	Mar. 31, 2018
Convertible Senior Notes
Convertible Senior Notes	9. Convertible Senior Notes On September 9, 2014, we completed a private placement of $287.5 million aggregate principal amount of 2.5% convertible senior notes due 2021 (the “2021 Notes”) resulting in net proceeds of $278.3 million after deducting offering expenses. In accordance with the accounting guidance, the conversion feature did not meet the criteria for bifurcation, and the entire principal amount was recorded as a long-term liability on the Consolidated Balance Sheets. The 2021 Notes are governed by the terms of the indenture between the Company, as issuer, and The Bank of New York Mellon Trust Company, N.A., as trustee. The 2021 Notes are senior unsecured obligations and bear interest at a rate of 2.5% per year, payable semi-annually in arrears on March 15 and September 15 of each year. The 2021 Notes will mature on September 15, 2021, unless earlier converted, redeemed or repurchased. Holders may convert all or any portion of the 2021 Notes at any time prior to the close of business on the business day immediately preceding the maturity date. Upon conversion, the holders will receive shares of our common stock at an initial conversion rate of 16.1616 shares per $1,000 in principal amount of 2021 Notes, equivalent to a conversion price of approximately $61.88 per share. The conversion rate is subject to adjustment upon the occurrence of certain events described in the indenture, but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date or upon our issuance of a notice of redemption, we will increase the conversion rate for holders who elect to convert the 2021 Notes in connection with such a corporate event or during the related redemption period in certain circumstances. On or after September 15, 2018, we may redeem the 2021 Notes, at our option, in whole or in part, if the last reported sale price of our common stock has been at least 150% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending not more than two trading days preceding the date on which we provide written notice of redemption at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the 2021 Notes. If we undergo a fundamental change, as defined in the indenture, prior to the maturity date of the 2021 Notes, holders may require us to repurchase for cash all or any portion of the 2021 Notes at a fundamental change repurchase price equal to 100% of the principal amount of the 2021 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The 2021 Notes rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the 2021 Notes; equal in right of payment to all of our liabilities that are not so subordinated; effectively junior in right of payment to any secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of our subsidiaries. In connection with the issuance of the 2021 Notes, we incurred $9.2 million of debt issuance costs. The debt issuance costs are presented as a deduction from the convertible senior notes on the Consolidated Balance Sheets and are amortized as interest expense over the expected life of the 2021 Notes using the effective interest method. We determined the expected life of the debt was equal to the seven-year term of the 2021 Notes. As of March 31, 2018 and December 31, 2017, the balance of unamortized debt issuance costs was $4.8 million and $5.1 million, respectively . The following table sets forth total interest expense recognized during the three months ended March 31, 2018 and 2017 (in thousands): Three months ended March 31, 2018 2017 Contractual interest expense $ 1,797 $ 1,797 Accretion of interest on milestone liability 512 467 Amortization of debt issuance costs 326 317 Total interest expense $ 2,635 $ 2,581 In April 2018, we completed the public offering of $300.0 million aggregate principal amount of 1.25% convertible senior notes due 2025. The net proceeds from this offering were approximately $292 million, after deducting underwriting discounts and commissions and offering expenses.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Stockholders’ Equity
Stockholders' Equity	10. Stockholders’ Equity Common Stock In April 2018, we sold 1,837,898 shares of our common stock in a public offering at $54.41 per share. The net proceeds from the offering were approximately $94 million, after deducting underwriting discounts and commissions and offering expenses. The holders of common stock are entitled to one vote per share on all matters to be voted upon by our stockholders. Subject to the preferences that may be applicable to any outstanding shares of preferred stock, the holders of common stock are entitled to receive ratably such dividends, if any, as may be declared by our Board of Directors. Accumulated Other Comprehensive Loss Accumulated other comprehensive loss consists of changes in foreign currency translation adjustments, which includes changes in a subsidiary’s functional currency, and unrealized gains and losses on available-for-sale securities. The changes in accumulated balances related to each component of other comprehensive income (loss) are summarized for the three months ended March 31, 2018 and 2017, as follows (in thousands): Foreign Currency Unrealized Total Accumulated Translation Adjustments (Losses) Gains Other Comprehensive Loss 2018 2017 2018 2017 2018 2017 Balance at December 31, $ (41,917) $ (47,434) $ (256) $ (146) $ (42,173) $ (47,580) Other comprehensive income (loss) 1,991 735 (7) (5) 1,984 730 Total before tax (39,926) (46,699) (263) (151) (40,189) (46,850) Tax effect (474) (268) 2 — (472) (268) Balance at March 31, $ (40,400) $ (46,967) $ (261) $ (151) $ (40,661) $ (47,118) The period change between December 31, 2017 and March 31, 2018 was primarily due to the currency translation of the goodwill and deferred income taxes associated with the acquisition of EOS in November 2013. There were no reclassifications out of accumulated other comprehensive loss in each of the three months ended March 31, 2018 and 2017.

Share-Based Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2018
Share-Based Compensation
Share-Based Compensation	11. Share-Based Compensation Share-based compensation expense for all equity based programs, including stock options, restricted stock units and the employee stock purchase plan, for the three months ended March 31, 2018 and 2017 was recognized in the accompanying Consolidated Statements of Operations as follows (in thousands): Three months ended March 31, 2018 2017 Research and development $ 5,376 $ 4,167 Selling, general and administrative 6,537 4,780 Total share-based compensation expense $ 11,913 $ 8,947 We did not recognize a tax benefit related to share-based compensation expense during the three months ended March 31, 2018 and 2017, respectively, as we maintain net operating loss carryforwards and have established a valuation allowance against the entire net deferred tax asset as of March 31, 2018. Stock Options The following table summarizes the activity relating to our options to purchase common stock for the three months ended March 31, 2018: Weighted Weighted Average Aggregate Average Remaining Intrinsic Number of Exercise Contractual Value Options Price Term (Years) (Thousands) Outstanding at December 31, 2017 5,789,735 $ 46.77 Granted 384,518 58.47 Exercised (21,431) 23.96 Forfeited (49,420) 67.03 Outstanding at March 31, 2018 (a) 6,103,402 $ 47.42 7.0 $ 91,682 Vested and expected to vest at March 31, 2018 5,805,355 $ 47.12 6.9 $ 89,099 Vested and exercisable at March 31, 2018 3,861,586 $ 44.56 6.0 $ 69,360 The aggregate intrinsic value in the table above represents the pretax intrinsic value, based on our closing stock price of $52.80 as of March 29, 2018, which would have been received by the option holders had all option holders with in-the-money options exercised their options as of that date. The following table summarizes information about our stock options as of and for the three months ended March 31, 2018 and 2017 (in thousands, except per share amounts): Three months ended March 31, 2018 2017 Weighted-average grant date fair value per share $ 43.14 $ 47.71 Intrinsic value of options exercised $ 762 $ 9,525 Cash received from stock option exercises $ 514 $ 5,674 As of March 31, 2018, the unrecognized share-based compensation expense related to unvested options, adjusted for expected forfeitures, was $75.3 million and the estimated weighted-average remaining vesting period was 2.65 years. Restricted Stock The following table summarizes the activity relating to our unvested restricted stock units (“RSUs”) for the three months ended March 31, 2018: Weighted Average Number of Grant Date Units Fair Value Unvested at December 31, 2017 589,529 $ 41.67 Granted 360,688 58.47 Vested (110,889) 40.00 Forfeited (9,746) 37.31 Unvested as of March 31, 2018 829,582 $ 49.25 Expected to vest after March 31, 2018 695,398 $ 48.78 As of March 31, 2018, the unrecognized share-based compensation expense related to unvested RSUs, adjusted for expected forfeitures, was $32.3 million and the estimated weighted-average remaining vesting period was 3.4 years.

License Agreements

License Agreements	3 Months Ended
	Mar. 31, 2018
License Agreements
License Agreements	12. License Agreements In June 2011, we entered into a worldwide license agreement with Pfizer, Inc. to obtain exclusive global rights to develop and commercialize rucaparib, a small molecule inhibitor of poly (ADP-ribose) polymerase (“PARP”), used for the treatment of selected solid tumors. The exclusive rights are exclusive even as to Pfizer and include the right to grant sublicenses. Pursuant to the terms of the license agreement, we made a $7.0 million upfront payment to Pfizer and are required to make additional payments to Pfizer for the achievement of certain development and regulatory and sales milestones and royalties on sales as required by the license agreement. Prior to the FDA approval of rucaparib, discussed below, we made milestone payments of $1.4 million, which were recognized as acquired in-process research and development expense. On August 30, 2016, we entered into a first amendment to the worldwide license agreement with Pfizer, which amends the June 2011 existing worldwide license agreement to permit us to defer payment of the milestone payments payable upon (i) FDA approval of an NDA for 1 st Indication in US and (ii) EMA approval of an MAA for 1 st Indication in EU, to a date that is 18 months after the date of achievement of such milestones. In the event that we defer such milestone payments, we have agreed to certain higher payments related to the achievement of such milestones. On December 19, 2016, the FDA approved Rubraca (rucaparib) tablets as monotherapy for the treatment of patients with deleterious BRCA mutation (germline and/or somatic) associated advanced ovarian cancer who have been treated with two or more chemotherapies, and selected for therapy based on an FDA-approved companion diagnostic for Rubraca. The FDA approval resulted in a $0.75 million milestone payment to Pfizer as required by the license agreement, which was made in the first quarter of 2017. The FDA approval also resulted in the obligation to pay a $20.0 million milestone payment, for which we have exercised the option to defer payment by agreeing to pay $23.0 million within 18 months after the date of the FDA approval. These payments were recognized as intangible assets and will be amortized over the estimated remaining useful life of Rubraca. On April 6, 2018, the FDA approved our sNDA for Rubraca as maintenance treatment of adult patients with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in a complete or partial response to platinum-based chemotherapy. This approval resulted in the obligation to pay a $15.0 million milestone payment, which we paid in April 2018. We are obligated under the license agreement to use commercially reasonable efforts to develop and commercialize rucaparib and we are responsible for all remaining development and commercialization costs for rucaparib. We are required to make regulatory milestone payments to Pfizer of up to an additional $51.75 million in aggregate if specified clinical study objectives and regulatory filings, acceptances and approvals are achieved. In addition, we are obligated to make sales milestone payments to Pfizer if specified annual sales targets for rucaparib are met, which relate to annual sales targets of $250.0 million and above, which, in the aggregate, could amount to total milestone payments of $170.0 million, and tiered royalty payments at a mid-teen percentage rate on our net sales, with standard provisions for royalty offsets to the extent we need to obtain any rights from third parties to commercialize rucaparib. In April 2012, we entered into a license agreement with AstraZeneca UK Limited to acquire exclusive rights associated with rucaparib under a family of patents and patent applications that claim methods of treating patients with PARP inhibitors in certain indications. The license enables the development and commercialization of rucaparib for the uses claimed by these patents. AstraZeneca will receive royalties on any net sales of rucaparib. We are party to other product license agreements for our other drug candidates, lucitanib and rociletinib (see our 2017 Form 10-K for additional details). During 2017, we completed the committed on-going development activities related to lucitanib and received full reimbursement of our development costs from Servier. Reimbursements are recorded as a reduction to research and development expense on the Consolidated Statements of Operations. Lucitanib was originally developed by Clovis and Servier with the hypothesis of activity in FGFR driven tumors; however, data in breast and lung cancer were insufficient to move the program forward. We have received notice from Servier of termination of their rights to lucitanib, resulting in the return of global rights (excluding China) for lucitanib to us later in 2018. We believe that recent data for a drug similar to lucitanib that inhibits these same pathways – when combined with a PD-1 inhibitor - provide support for development of lucitanib in combination with a PD(L)-1 inhibitor, and we are exploring a study of the combination. We also intend to initiate a study of lucitanib in combination with Rubraca, based on encouraging data of VEGF and PARP inhibitors in combination. Each of these studies is expected to initiate by the end of 2018 or in the first quarter of 2019.

Net Loss Per Common Share

Net Loss Per Common Share	3 Months Ended
	Mar. 31, 2018
Net Loss Per Common Share
Net Loss Per Common Share	13. Net Loss Per Common Share Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common share equivalents outstanding using the treasury-stock method for the stock options and RSUs and the if-converted method for the 2021 Notes. As a result of our net losses for the periods presented, all potentially dilutive common share equivalents were considered anti-dilutive and were excluded from the computation of diluted net loss per share. The shares outstanding at the end of the respective periods presented in the table below were excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in thousands): Three months ended March 31, 2018 2017 Common shares under option 3,908 3,557 Convertible senior notes 4,646 4,646 Total potential dilutive shares 8,554 8,203

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies
Commitments and Contingencies	14. Commitments and Contingencies Royalty and License Fee Commitments We have entered into certain license agreements, as identified in Note 12, License Agreements , with third parties that include the payment of development and regulatory milestones, as well as royalty payments, upon the achievement of pre-established development, regulatory and commercial targets. Our payment obligation related to these license agreements is contingent upon the successful development, regulatory approval and commercialization of the licensed products. Due to the nature of these arrangements, the future potential payments are inherently uncertain, and accordingly, we only recognize payment obligations which are probable and estimable as of the balance sheet date. Milestone liabilities of $22.5 million and $22.0 million are recorded on our Consolidated Balance Sheets at March 31, 2018 and December 31, 2017, respectively, and relate to milestone payments for the licensing of our rucaparib product, which was approved by the FDA on December 19, 2016. Manufacture and Services Agreement Commitments On October 3, 2016, we entered into a Manufacturing and Services Agreement (the “Agreement”) with a non-exclusive third-party supplier for the production of the active ingredient for Rubraca. Under the terms of the Agreement, we will provide the third-party supplier a rolling forecast for the supply of the active ingredient in Rubraca that will be updated by us on a quarterly basis. We are obligated to order material sufficient to satisfy an initial quantity specified in any forecast. In addition, the third-party supplier will construct, in its existing facility, a production train that will be exclusively dedicated to the manufacture of the Rubraca active ingredient. We are obligated to make scheduled capital program fee payments toward capital equipment and other costs associated with the construction of the dedicated production train. Further, once the facility is operational, we are obligated to pay a fixed facility fee each quarter for the duration of the Agreement, which expires on December 31, 2025, unless extended by mutual consent of the parties. As of March 31, 2018, $197.3 million of purchase commitments exist under the Agreement. Legal Proceedings We and certain of our officers were named as defendants in several lawsuits, as described below. We cannot reasonably predict the outcome of these legal proceedings, nor can we estimate the amount of loss or range of loss, if any, that may result. An adverse outcome in these proceedings could have a material adverse effect on our results of operations, cash flows or financial condition. Rociletinib-Related Litigation Following Clovis’ regulatory announcement in November 2015 of adverse developments in its ongoing clinical trials for rociletinib, Clovis and certain of its current and former executives were named in various securities lawsuits, the largest of which was a putative class action lawsuit in the District of Colorado (the “Medina Action”) which was settled on October 26, 2017 (the “Medina Settlement”). The open actions currently pending against Clovis are discussed below. On January 22, 2016, the Electrical Workers Local #357 Pension and Health & Welfare Trusts, a purported shareholder of Clovis, filed a purported class action complaint (the “Electrical Workers Complaint”) against Clovis and certain of its officers, directors, investors and underwriters in the Superior Court of the State of California, County of San Mateo (the “Electrical Workers Court”). The Electrical Workers Complaint purported to be asserted on behalf of a class of persons who purchased stock in the July 2015 Offering. The complaint asserted claims under certain provisions of the Securities Act of 1933 (the “Securities Act”) relating to a July 2015 follow-on offering of Clovis securities (the “July 2015 Offering”) based on substantially similar allegations to those asserted in the Medina Action. On June 30, 2016, the Electrical Workers Plaintiffs filed an amended complaint adding new allegations (the “Amended Complaint”). On April 10, 2018, the Court entered an order dismissing the Electrical Workers Action on the basis of the Medina Settlement. On November 10, 2016, Antipodean Domestic Partners (“Antipodean”) filed a complaint (the “Antipodean Complaint”) against Clovis and certain of its officers, directors and underwriters in New York Supreme Court, County of New York. The Antipodean Complaint alleges that the defendants violated certain sections of the Securities Act by making allegedly false statements to Antipodean and in the offering materials for the July 2015 Offering relating to the efficacy of rociletinib, its safety profile, and its prospects for market success. In addition to the Securities Act claims, the Antipodean Complaint also asserts Colorado state law claims and common law claims. Both the state law and common law claims are based on allegedly false and misleading statements regarding rociletinib’s progress toward FDA approval. The Antipodean Complaint seeks compensatory, recessionary, and punitive damages. On December 15, 2016, the Antipodean Plaintiffs filed an amended complaint (the “Antipodean Amended Complaint”) asserting substantially the same claims against the same defendants and purporting to correct certain details in the original Antipodean Complaint. On January 31, 2017, the defendants filed a motion to stay the Antipodean action pending resolution of the Medina Action in the District of Colorado. Defendants also filed a motion to dismiss the Antipodean Amended Complaint on March 29, 2017. On March 14, 2017, the Clovis defendants and Antipodean participated in a mediation, which did not result in a settlement. On August 8, 2017, the parties participated in a scheduled hearing on the defendants’ motion to stay and motion to dismiss before Justice Masley of the New York Supreme Court, County of New York. At the hearing, Justice Masley granted the defendants’ motion to stay. Per the Court’s August 10, 2017 order, the defendants’ motion to dismiss was held in abeyance and deemed submitted on November 1, 2017. On November 1, 2017, the defendants provided a status update to the Court regarding the outcome of the hearing. The update informed the Court that Antipodean had excluded itself from the Medina Settlement, as memorialized in the final judgment entered by the Medina Court. On April 17, 2018, the parties participated in a Preliminary Conference, following which the Court entered a preliminary conference order, providing for, among other things, an end date for discovery of February 4, 2019. On May 2, 2018, the Court issued an order denying the defendants’ motion to dismiss. Defendants have 20 days from service of a copy of the order with notice of entry to answer the allegations in the Antipodean Amended Complaint. The Company intends to vigorously defend against the allegations in the Antipodean Amended Complaint. However, there can be no assurance that the defense will be successful. In March 2017, two putative shareholders of the Company, Macalinao and McKenry (the “Derivative Plaintiffs”), filed shareholder derivative complaints against certain directors and officers of the Company in the Court of Chancery of the State of Delaware. On May 4, 2017, the Macalinao and McKenry actions were consolidated for all purposes in a single proceeding under the caption In re Clovis Oncology, Inc. Derivative Litigation, Case No, 2017-0222 (the “Consolidated Derivative Action”). On May 18, 2017, the Derivative Plaintiffs filed a Consolidated Verified Shareholder Derivative Complaint (the “Consolidated Derivative Complaint”). The Consolidated Derivative Complaint generally alleged that the defendants breached their fiduciary duties owed to the Company by allegedly causing or allowing misrepresentations of the Company’s business operations and prospects, failing to ensure that the TIGER-X clinical trial was being conducted in accordance with applicable rules, regulations and protocols, and engaging in insider trading. The Consolidated Derivative Complaint purported to rely on documents produced by the Company in response to prior demands for inspection of the Company’s books and records served on the Company by each of Macalinao and McKenry under 8 Del. C. § 220. The Consolidated Derivative Complaint sought, among other things, an award of money damages. On July 31, 2017, the defendants filed a motion to dismiss the Consolidated Derivative Complaint. Plaintiffs filed an opposition to the motion to dismiss on August 31, 2017, and the defendants filed a reply in further support of the motion to dismiss on September 26, 2017. Oral argument on the defendants’ motion to dismiss the Consolidated Derivative Complaint has been scheduled for August 2, 2018. The Company intends to vigorously defend against the allegations in the Consolidated Derivative Complaint, but there can be no assurance that the defense will be successful. On March 20, 2017, a purported shareholder of the Company, filed a shareholder derivative complaint (the “Guo Complaint”) against certain officers and directors of the Company in the United States District Court for the District of Colorado. The Guo Complaint generally alleged that the defendants breached their fiduciary duties owed to the Company by either recklessly or with gross negligence approving or permitting misrepresentations of the Company’s business operations and prospects. The Guo Complaint also alleged claims for waste of corporate assets and unjust enrichment. Finally, the Guo Complaint alleged that certain of the individual defendants violated Section 14(a) of the Securities Exchange Act, by allegedly negligently issuing, causing to be issued, and participating in the issuance of materially misleading statements to stockholders in the Company’s Proxy Statement on Schedule DEF 14A in connection with the 2015 Annual Meeting of Stockholders, held on June 11, 2015. The Guo Complaint sought, among other things, an award of money damages. On June 19, 2017, the parties filed a joint motion to stay the Guo action pending resolution of the motion to dismiss the Consolidated Derivative Complaint. On June 20, 2017, the court granted the motion to stay. The Company intends to vigorously defend against the allegations in the Guo Complaint, but there can be no assurance that the defense will be successful. As previously disclosed, the Company has received inquiries and requests for information from governmental agencies, including the U.S. Securities and Exchange Commission and the U.S. Department of Justice, relating to the Company’s regulatory update announcement in November 2015 that the FDA requested additional clinical data on the efficacy and safety of rociletinib. On April 9, 2018, the Company received a “Wells Notice” letter from the staff of the SEC issued in connection with this investigation. Certain of our current and former officers also received Wells Notices. The Wells Notices advise that the staff has made a preliminary determination to recommend to the SEC that it file an action against us and certain of our current and former officers regarding possible violations of Sections 17(a)(1), (2) and (3) of the Securities Act of 1933 and Sections 10(b) and 13(a) of the Securities Act of 1934 and Rules 10b-5(a), (b), and (c), 12b-20, and 13(a)-11 thereunder. The Wells Notices state that the SEC staff’s recommendation may involve a civil injunctive action, public administrative proceeding, and/or cease-and-desist proceeding, and may seek remedies that include an injunction, cease-and-desist order, disgorgement, pre-judgment interest, and civil money penalties, and in the case of certain officers a bar from service as an officer or director of a public company. Under SEC procedures, a recipient of a Wells Notice has an opportunity to respond in the form of a “Wells submission” that seeks to persuade the SEC that such an action should not be brought. The Company has provided to the SEC staff Wells submissions to further explain their views and beliefs that no enforcement action is warranted against the Company or any individuals associated with the Company. The receipt of the Wells Notice does not change the Company’s beliefs that it has complied with all laws and regulations, and therefore, the Company intends to contest any charges that may be brought, though there can be no assurance that the defense will be successful. Director Compensation Litigation On May 10, 2017, John Solak, a purported shareholder of the Company, filed a shareholder derivative complaint in the Court of Chancery of the State of Delaware (the “Solak Complaint”) against certain directors and an officer of the Company. The Solak Complaint generally alleged that the defendants breached their fiduciary duties owed to the Company by adopting a compensation plan that overcompensated the non-employee director defendants, in relation to companies of comparable market capitalization and size. The Solak Complaint also alleged claims of waste of corporate assets and unjust enrichment. The Solak Complaint sought, among other things, an award of money damages and the imposition of corporate governance reforms. On February 26, 2018, the defendants entered into a stipulation of compromise and settlement with plaintiff that is intended to settle the Solak action. The proposed settlement is subject to Court approval upon the conclusion of a settlement hearing concerning the fairness of the terms of the proposed settlement, which has been scheduled for May 30, 2018 at 2:00 p.m. In accordance with the terms of the proposed settlement, the Company will present a new non-employee director compensation policy for shareholder vote at the next annual shareholder meeting. Under the proposed new non-employee director compensation policy, annual base compensation for incumbent non-employee directors would be set at $400,000 for a three-year period. Additionally, the proposed policy sets annual base compensation for new non-employee directors at $600,000 for a three-year period and includes fixed annual fees for board and committee service. The proposed settlement also sets forth a number of corporate governance reforms that the Company will undertake, including, enhanced proxy disclosures, the codification of the Company’s stock ownership guidelines for directors, and enhanced disclosure requirements for certain forms of director compensation. While no cash payments will be made to investors as part of the proposed settlement, plaintiff’s counsel is expected to file a fee application, which the Company has agreed not to oppose up to $395,000. The proposed settlement contains no admission of wrongdoing.

Summary of Significant Accoun20

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Summary of Significant Accounting Policies
Basis of Presentation	Basis of Presentation All financial information presented includes the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The unaudited financial statements of Clovis Oncology, Inc. included herein reflect all adjustments, consisting only of normal recurring adjustments that, in the opinion of management, are necessary to fairly state our financial position, results of operations and cash flows for the periods presented herein. Interim results may not be indicative of the results that may be expected for the full year. Certain information and footnote disclosures normally included in audited financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto which are included in our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”) for a broader discussion of our business and the opportunities and risks inherent in such business.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, expenses and revenue and related disclosures. On an ongoing basis, we evaluate our estimates, including estimates related to revenue deductions, intangible asset impairment, clinical trial accruals and share-based compensation expense. We base our estimates on historical experience and other market-specific or other relevant assumptions that we believe to be reasonable under the circumstances. Actual results may differ from those estimates or assumptions.
Liquidity	Liquidity We have incurred significant net losses since inception and have relied on our ability to fund our operations through debt and equity financings. We expect operating losses and negative cash flows to continue for the foreseeable future. As we continue to incur losses, transition to profitability is dependent upon achieving a level of revenues from Rubraca adequate to support our cost structure. We may never achieve profitability, and unless or until we do, we will continue to need to raise additional cash. In April 2018, we sold 1,837,898 shares of our common stock in a public offering at $54.41 per share. The net proceeds from the offering were approximately $94 million, after deducting underwriting discounts and commissions and offering expenses. Concurrently, we completed the public offering of $300.0 million aggregate principal amount of 1.25% convertible senior notes due 2025. The net proceeds from this offering were approximately $292 million, after deducting underwriting discounts and commissions and offering expenses. We intend to use the net proceeds of the offerings for general corporate purposes, including sales and marketing expenses associated with Rubraca in the United States and, if approved by the European Commission, in Europe, funding of our development programs, general and administrative expenses, acquisition or licensing of additional product candidates or businesses and working capital. Based on current estimates, we believe that our existing cash, cash equivalents and available-for-sale securities will allow us to fund our operating plan through at least the next 12 months.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-09, “Revenue from Contracts with Customers”, and has subsequently issued several supplemental and/or clarifying ASUs (collectively, “ASC 606”). ASC 606 prescribes a single common revenue standard that replaces most existing U.S. GAAP revenue recognition guidance. ASC 606 is intended to provide a more consistent interpretation and application of the principles outlined in the standard across filers in multiple industries and within the same industries compared to current practices, which should improve comparability. Adoption of ASC 606 is required for annual and interim periods beginning after December 15, 2017. Upon adoption, we must elect to adopt either retrospectively to each prior reporting period presented or use the modified retrospective transition method with the cumulative effect of initial adoption recognized at the date of initial application. We adopted the new standard using the modified retrospective method on January 1, 2018 for contracts that are not completed as of the adoption date. Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the entity performs 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) the entity satisfies a performance obligation. ASC 606 also impacts certain other areas, such as the accounting for costs to obtain or fulfill a contract. The standard also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We have examined our revenue recognition policy specific to revenue streams from representative contracts governing product sales from Rubraca and have come to conclusions on the impact of the new standard using the 5-step process prescribed by ASC 606. We have reviewed a representative sample of contracts, including our collaboration agreements with Servier and Bristol-Myers Squibb, and determined the potential impact to our accounting policies, financial controls and operations. Our conclusions include recognizing revenue on product sales once the product is sold to the specialty distributor and specialty pharmacy providers. As noted above, we used the modified retrospective method to adopt the new standard. This means that we did not restate previously issued financial statements, but we recorded a one-time adjustment to retained earnings of $2.4 million. This adjustment represents the sales of our product to our customers prior to January 1, 2018, that have not been sold to patients or healthcare providers, offset by related gross-to-net adjustments and other direct costs, including royalties and sales incentive compensation. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance at Adjustments due to Balance at December 31, 2017 Adoption of ASC 606 January 1, 2018 ASSETS Accounts receivable, net $ 6,181 $ 3,336 $ 9,517 Inventories $ 27,508 (62) $ 27,446 Total assets $ 735,230 $ 3,274 $ 738,504 LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 25,883 $ 918 $ 26,801 Accumulated deficit $ (1,477,440) 2,356 $ (1,475,084) Total liabilities and stockholders' equity $ 735,230 $ 3,274 $ 738,504 Previously, we recognized revenue on product sales once the product was sold to the patient or healthcare provider by the specialty distributor or specialty pharmacy provider, i.e. when product is sold through the channel. Effective January 1, 2018, we began recognizing revenue when our customers, the specialty distributors and specialty pharmacy providers, take control of our product or when product is sold into the channel. This will have the impact of us recognizing revenue approximately two to four weeks earlier than before adopting the new standard and will also increase the significance of estimating variable consideration. The impact of adoption on our consolidated statement of operations and comprehensive loss and consolidated balance sheet for the quarter ended March 31, 2018 was as follows (in thousands, except per share amounts): Balances without Effect of Change As reported Adoption of ASC 606 Higher/(Lower) CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS Product revenue $ 18,523 $ 17,956 $ 567 Cost of sales - product $ 4,006 $ 3,541 $ 465 Selling, general and administrative $ 39,274 $ 39,234 $ 40 Net loss $ (77,694) $ (77,756) $ (62) Loss per basic and diluted common share: Basic and diluted net loss per common share $ (1.54) $ (1.54) $ (0.00) CONSOLIDATED BALANCE SHEET ASSETS Accounts receivable, net $ 12,936 $ 12,322 $ 614 Inventories $ 69,192 $ 69,559 $ (367) LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 27,306 $ 27,120 $ 186 Accumulated deficit $ (1,552,778) $ (1,552,840) $ (62) ASC 606 did not have an aggregate impact on our net cash provided by operating activities, but resulted in offsetting changes in certain assets and liabilities presented within net cash used in operating activities in our consolidated statement of cash flows, as reflected in the above tables. In May 2017, the FASB issued ASU 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting”, which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which we would be required to apply modification accounting under ASC 718. Specifically, we would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. The guidance is effective for us on January 1, 2018 and the adoption resulted in no change to our consolidated financial statements and related disclosures.
Recently Issued Accounting Standards	Recently Issued Accounting Standards From time to time, the FASB or other standards setting bodies issue new accounting pronouncements. Updates to the FASB Accounting Standards Codification (“ASC”) are communicated through issuance of an ASU. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”, which requires lessees to recognize assets and liabilities for the rights and obligations created by most leases on their balance sheet. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. ASU 2016-02 requires modified retrospective adoption for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. We are currently evaluating the impact the standard may have on our consolidated financial statements and related disclosures. In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which allow a reclassification from accumulated other comprehensive income (loss) (“AOCI”) to retained earnings for stranded tax effects resulting from the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts at the date of enactment of the Tax Cuts and Jobs Act of 2017 (the “2017 Tax Act”). The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact the standard may have on our consolidated financial statements and related disclosures.
Revenue Recognition	Revenue Recognition We are currently approved to sell Rubraca in the United States market. We distribute our product principally through a limited number of specialty distributor and specialty pharmacy providers, collectively, our customers. Our customers subsequently sell our products to patients and health care providers. Separately, we have arrangements with certain payors and other third-parties that provide for government-mandated and privately-negotiated rebates, chargebacks and discounts. Product Revenue We are currently approved to sell Rubraca in the United States market. We distribute our product principally through a limited number of specialty distributor and specialty pharmacy providers, collectively, our customers. Our customers subsequently sell our products to patients and health care providers. Separately, we have arrangements with certain payors and other third-parties that provide for government-mandated and privately-negotiated rebates, chargebacks and discounts. Revenue from product sales are recognized when the performance obligation is satisfied, which is when customers obtain control of our product at a point in time, typically upon delivery. We expense incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have recognized is one year or less. Reserves for Variable Consideration Revenues from product sales are recorded at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are established and which result from rebates, chargebacks, discounts, co-pay assistance, estimated product returns and other allowances that are offered within contracts between us and our customers, health care providers, payors and other indirect customers relating to the sales of our product. These reserves are based on the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (if the amount is payable to the customers) or a current liability (if the amount is payable to a party other than a customer). Where appropriate, these estimates take into consideration a range of possible outcomes which are probability-weighted for relevant factors such as our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Overall, these reserves reflect our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration which is included in the transaction price may be constrained, and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of consideration ultimately received may differ from our estimates. If actual results in the future vary from our estimates, we adjust these estimates, which would affect product revenue and earnings in the period such variances become known. Rebates . Rebates include mandated discounts under the Medicaid Drug Rebate Program and the Medicare coverage gap program. Rebates are amounts owed after the final dispensing of products to a benefit plan participant and are based upon contractual agreements or legal requirements with the public-sector benefit providers. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue and the establishment of a current liability which is included in accrued expenses on the consolidated balance sheet. We estimate our Medicaid and Medicare rebates based upon a range of possible outcomes that are probability-weighted for the estimated payor mix. The accrual for rebates is based on statutory discount rates and known sales to specialty pharmacy patients, or expected utilization for specialty distributor sales to healthcare providers. As we gain more historical experience, the accrual will be based solely on the expected utilization from historical data we have accumulated since the Rubraca product launch. Rebates are generally invoiced and paid quarterly in arrears so that the accrual balance consists of an estimate of the amount expected to be incurred for the current quarter’s activity, plus an accrual balance for known or estimated prior quarters’ unpaid rebates. Chargebacks . Chargebacks are discounts that occur when contracted customers, which currently consist primarily of group purchasing organizations, Public Health Service organizations and federal government entities purchasing via the Federal Supply Schedule, purchase directly from our specialty distributors at a discounted price. The specialty distributor, in turn, charges back the difference between the price initially paid by the specialty distributor and the discounted price paid to the specialty distributor by the healthcare provider. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue and accounts receivable. The accrual for specialty distributor chargebacks is estimated based on known chargeback rates and known sales to specialty distributors adjusted for the estimated utilization by healthcare providers. Discounts and Fees . Our payment terms are approximately 30 days. Specialty distributors and specialty pharmacies are offered various forms of consideration, including service fees and prompt pay discounts for payment within a specified period. We expect these customers will earn prompt pay discounts and therefore, we deduct the full amount of these discounts and service fees from product sales when revenue is recognized. Co-pay assistance . Patients who have commercial insurance and meet certain eligibility requirements may receive co-pay assistance. The intent of this program is to reduce the patient’s out of pocket costs. Liabilities for co-pay assistance are based on actual program participation provided by third-party administrators at month end. Returns . Consistent with industry practice, we generally offer customers a right of return limited only to product that will expire in six months or product that is six months beyond the expiration date. To date, we have had minimal product returns and we currently do not have an accrual for product returns. We will continue to assess our estimate for product returns as we gain additional historical experience.
Cost of Sales	Cost of Sales – Product Product cost of sales consists primarily of materials, third-party manufacturing costs as well as freight and royalties owed to our licensing partners for Rubraca sales. Cost of Sales – Intangible Asset Amortization Cost of sales for intangible asset amortization consists of the amortization of capitalized milestone payments made to our licensing partners upon FDA approval of Rubraca. Milestone payments are amortized on a straight-line basis over the estimated remaining patent life of Rubraca.
Inventory	Inventory Inventories are stated at the lower of cost or estimated net realizable value, on a first-in, first-out (“FIFO”) basis. We began capitalizing incurred inventory related costs upon the regulatory approval of Rubraca. Prior to the regulatory approval of Rubraca, we incurred costs for the manufacture of the drug that could potentially be available to support the commercial launch of Rubraca and all such costs were recognized as research and development expense. We periodically analyze our inventory levels, and write down inventory that has become obsolete, inventory that has a cost basis in excess of its estimated realizable value and/or inventory in excess of expected sales requirements as cost of product revenues. Expired inventory would be disposed of and the related costs would be written off as cost of product revenues. The active pharmaceutical ingredient (“API”) in Rubraca is currently produced by a single supplier. As the API has undergone significant manufacturing specific to its intended purpose at the point it is purchased by us, we classify the API as work-in-process inventory. Our other significant accounting policies are described in Note 2, Summary of Significant Accounting Policies of the Notes to the Consolidated Financial Statements included in our 2017 Form 10-K.
Convertible Senior Notes	The debt issuance costs are presented as a deduction from the convertible senior notes on the Consolidated Balance Sheets and are amortized as interest expense over the expected life of the 2021 Notes using the effective interest method. We determined the expected life of the debt was equal to the seven-year term of the 2021 Notes.
Lucitanib	Reimbursements are recorded as a reduction to research and development expense on the Consolidated Statements of Operations. Lucitanib was originally developed by Clovis and Servier with the hypothesis of activity in FGFR driven tumors; however, data in breast and lung cancer were insufficient to move the program forward. We have received notice from Servier of termination of their rights to lucitanib, resulting in the return of global rights (excluding China) for lucitanib to us later in 2018.
Net Loss Per Common Share	Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common share equivalents outstanding using the treasury-stock method for the stock options and RSUs and the if-converted method for the 2021 Notes. As a result of our net losses for the periods presented, all potentially dilutive common share equivalents were considered anti-dilutive and were excluded from the computation of diluted net loss per share.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
ASU 2014-09
Revenue Recognition
Schedule of new accounting pronouncements	The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance at Adjustments due to Balance at December 31, 2017 Adoption of ASC 606 January 1, 2018 ASSETS Accounts receivable, net $ 6,181 $ 3,336 $ 9,517 Inventories $ 27,508 (62) $ 27,446 Total assets $ 735,230 $ 3,274 $ 738,504 LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 25,883 $ 918 $ 26,801 Accumulated deficit $ (1,477,440) 2,356 $ (1,475,084) Total liabilities and stockholders' equity $ 735,230 $ 3,274 $ 738,504 Previously, we recognized revenue on product sales once the product was sold to the patient or healthcare provider by the specialty distributor or specialty pharmacy provider, i.e. when product is sold through the channel. Effective January 1, 2018, we began recognizing revenue when our customers, the specialty distributors and specialty pharmacy providers, take control of our product or when product is sold into the channel. This will have the impact of us recognizing revenue approximately two to four weeks earlier than before adopting the new standard and will also increase the significance of estimating variable consideration. The impact of adoption on our consolidated statement of operations and comprehensive loss and consolidated balance sheet for the quarter ended March 31, 2018 was as follows (in thousands, except per share amounts): Balances without Effect of Change As reported Adoption of ASC 606 Higher/(Lower) CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS Product revenue $ 18,523 $ 17,956 $ 567 Cost of sales - product $ 4,006 $ 3,541 $ 465 Selling, general and administrative $ 39,274 $ 39,234 $ 40 Net loss $ (77,694) $ (77,756) $ (62) Loss per basic and diluted common share: Basic and diluted net loss per common share $ (1.54) $ (1.54) $ (0.00) CONSOLIDATED BALANCE SHEET ASSETS Accounts receivable, net $ 12,936 $ 12,322 $ 614 Inventories $ 69,192 $ 69,559 $ (367) LIABILITIES AND STOCKHOLDERS' EQUITY Other accrued expenses $ 27,306 $ 27,120 $ 186 Accumulated deficit $ (1,552,778) $ (1,552,840) $ (62)

Financial Instruments and Fai22

Financial Instruments and Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Financial Instruments and Fair Value Measurements
Assets Measured at Fair Value on Recurring Basis	The following table identifies our assets and liabilities that were measured at fair value on a recurring basis (in thousands): Balance Level 1 Level 2 Level 3 March 31, 2018 Assets: Money market $ 294,559 $ 294,559 $ — $ — U.S. treasury securities 89,697 — 89,697 — Total assets at fair value $ 384,256 $ 294,559 $ 89,697 $ — December 31, 2017 Assets: Money market $ 433,136 $ 433,136 $ — $ — U.S. treasury securities 99,533 — 99,533 — Total assets at fair value $ 532,669 $ 433,136 $ 99,533 $ —

Available-for-Sale Securities (

Available-for-Sale Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Available-for-Sale Securities
Summary of Available-for-Sale Securities	As of March 31, 2018, available-for-sale securities consisted of the following (in thousands): Gross Gross Aggregate Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. treasury securities $ 89,821 $ — $ (124) $ 89,697 As of December 31, 2017, available-for-sale securities consisted of the following (in thousands): Gross Gross Aggregate Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. treasury securities $ 99,650 $ — $ (117) $ 99,533
Schedule of Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity	As of March 31, 2018, the amortized cost and fair value of available-for-sale securities by contractual maturity were (in thousands): Amortized Fair Cost Value Due in one year or less $ 89,821 $ 89,697 Due in one year to two years — — Total $ 89,821 $ 89,697

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2018
Inventories
Schedule of Inventories	March 31, December 31, 2018 2017 Work-in-process $ 67,437 $ 24,721 Finished goods 1,755 2,787 Total inventories $ 69,192 $ 27,508

Other Current Assets (Tables)

Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Other Current Assets
Other Current Assets	Other current assets were comprised of the following (in thousands): March 31, December 31, 2018 2017 Prepaid insurance $ 1,427 $ 1,926 Prepaid expenses - other 5,684 3,355 Receivable - other 1,780 2,023 Other 224 196 Total $ 9,115 $ 7,500

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	3 Months Ended
	Mar. 31, 2018
Intangible Assets and Goodwill
Intangible assets related to capitalized milestones under license agreements	Intangible assets related to capitalized milestones under license agreements consisted of the following (in thousands): March 31, December 31, 2018 2017 Intangible asset - milestones $ 21,100 $ 21,100 Accumulated amortization (1,911) (1,539) Total intangible asset, net $ 19,189 $ 19,561
Estimated future amortization expense for intangible assets	Estimated future amortization expense associated with intangibles is expected to be as follows (in thousands): 2018 $ 1,114 2019 1,486 2020 1,486 2021 1,486 2022 1,486 Thereafter 12,131 $ 19,189
Summary of Goodwill	The change in goodwill established as part of the purchase accounting of EOS in November 2013 consisted of the following (in thousands): Balance at December 31, 2017 $ 65,217 Change in foreign currency gains and losses 1,743 Balance at March 31, 2018 $ 66,960

Other Accrued Expenses (Tables)

Other Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2018
Other Accrued Expenses
Other Accrued Expenses	Other accrued expenses were comprised of the following (in thousands): March 31, December 31, 2018 2017 Accrued personnel costs $ 7,381 $ 13,889 Accrued interest payable 299 2,096 Income tax payable 45 — Accrued corporate legal fees and professional services 137 415 Accrued royalties 4,025 2,984 Accrued variable considerations 1,391 1,008 Payable to third party logistics provider 2,661 2,661 Accrued legal settlement cost 7,975 — Accrued expenses - other 3,392 2,830 Total $ 27,306 $ 25,883

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	3 Months Ended
	Mar. 31, 2018
Convertible Senior Notes
Schedule of Total Interest Expense Recognized Related to Notes	The following table sets forth total interest expense recognized during the three months ended March 31, 2018 and 2017 (in thousands): Three months ended March 31, 2018 2017 Contractual interest expense $ 1,797 $ 1,797 Accretion of interest on milestone liability 512 467 Amortization of debt issuance costs 326 317 Total interest expense $ 2,635 $ 2,581

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Stockholders’ Equity
Component of Other Comprehensive Income (Loss)	The changes in accumulated balances related to each component of other comprehensive income (loss) are summarized for the three months ended March 31, 2018 and 2017, as follows (in thousands): Foreign Currency Unrealized Total Accumulated Translation Adjustments (Losses) Gains Other Comprehensive Loss 2018 2017 2018 2017 2018 2017 Balance at December 31, $ (41,917) $ (47,434) $ (256) $ (146) $ (42,173) $ (47,580) Other comprehensive income (loss) 1,991 735 (7) (5) 1,984 730 Total before tax (39,926) (46,699) (263) (151) (40,189) (46,850) Tax effect (474) (268) 2 — (472) (268) Balance at March 31, $ (40,400) $ (46,967) $ (261) $ (151) $ (40,661) $ (47,118)

Share-Based Compensation (Table

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Share-Based Compensation
Share-Based Compensation Expense Recognized in Accompanying Statements of Operations	Share-based compensation expense for all equity based programs, including stock options, restricted stock units and the employee stock purchase plan, for the three months ended March 31, 2018 and 2017 was recognized in the accompanying Consolidated Statements of Operations as follows (in thousands): Three months ended March 31, 2018 2017 Research and development $ 5,376 $ 4,167 Selling, general and administrative 6,537 4,780 Total share-based compensation expense $ 11,913 $ 8,947
Summary of Stock Options Activity	Weighted Weighted Average Aggregate Average Remaining Intrinsic Number of Exercise Contractual Value Options Price Term (Years) (Thousands) Outstanding at December 31, 2017 5,789,735 $ 46.77 Granted 384,518 58.47 Exercised (21,431) 23.96 Forfeited (49,420) 67.03 Outstanding at March 31, 2018 (a) 6,103,402 $ 47.42 7.0 $ 91,682 Vested and expected to vest at March 31, 2018 5,805,355 $ 47.12 6.9 $ 89,099 Vested and exercisable at March 31, 2018 3,861,586 $ 44.56 6.0 $ 69,360
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award	The following table summarizes information about our stock options as of and for the three months ended March 31, 2018 and 2017 (in thousands, except per share amounts): Three months ended March 31, 2018 2017 Weighted-average grant date fair value per share $ 43.14 $ 47.71 Intrinsic value of options exercised $ 762 $ 9,525 Cash received from stock option exercises $ 514 $ 5,674
Summary of activity related to our unvested RSUs	Weighted Average Number of Grant Date Units Fair Value Unvested at December 31, 2017 589,529 $ 41.67 Granted 360,688 58.47 Vested (110,889) 40.00 Forfeited (9,746) 37.31 Unvested as of March 31, 2018 829,582 $ 49.25 Expected to vest after March 31, 2018 695,398 $ 48.78

Net Loss Per Common Share (Tabl

Net Loss Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Net Loss Per Common Share
Shares Outstanding Excluded from Calculation of Diluted Net Loss Per Share	The shares outstanding at the end of the respective periods presented in the table below were excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in thousands): Three months ended March 31, 2018 2017 Common shares under option 3,908 3,557 Convertible senior notes 4,646 4,646 Total potential dilutive shares 8,554 8,203

Nature of Business and Basis 32

Nature of Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2018USD ($)$ / sharesshares	Mar. 31, 2018segmentproductitem	Mar. 31, 2017USD ($)
Number of operating segments | segment		1
Number of other product candidates | product		2
Proceeds from offering			$ 221,224
Minimum estimated number of months operating plan funded		12 months
Minimum
Number of chemotherapies received by an adult patient | item		2
Number of prior lines of platinum based chemotherapy received by patient | item		2
Subsequent Event
Issuance of common stock, net of issuance costs (in shares) | shares	1,837,898
Sale of stock, price per share | $ / shares	$ 54.41
Proceeds from offering	$ 94,000
Aggregate principal amount of public offering	$ 300,000
Convertible senior notes, interest rate	1.25%
Net proceeds from convertible senior notes	$ 292,000

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenues:
Product revenue	$ 18,523
Cost of sales - product	4,006
Selling, general and administrative	39,274	$ 29,224
Net loss	$ (77,694)	$ (58,464)
Loss per basic and diluted common share:
Basic and diluted net loss per common share	$ (1.54)	$ (1.33)
Assets
Accounts receivable, net	$ 12,936		$ 9,517	$ 6,181
Inventories	69,192		27,446	27,508
Assets	678,924		738,504	735,230
Liabilities
Other accrued expenses	27,306		26,801	25,883
Accumulated deficit	(1,552,778)		(1,475,084)	(1,477,440)
Liabilities And Stockholders Equity	$ 678,924		738,504	$ 735,230
Product Revenue
Amortization period of the asset	true
ASU 2014-09 | Balances without Adoption of ASC 606
Revenues:
Product revenue	$ 17,956
Cost of sales - product	3,541
Selling, general and administrative	39,234
Net loss	$ (77,756)
Loss per basic and diluted common share:
Basic and diluted net loss per common share	$ (1.54)
Assets
Accounts receivable, net	$ 12,322
Inventories	69,559
Liabilities
Other accrued expenses	27,120
Accumulated deficit	(1,552,840)
ASU 2014-09 | Effect of Change Higher/(Lower)
Revenues:
Product revenue	567
Cost of sales - product	465
Selling, general and administrative	40
Net loss	$ (62)
Loss per basic and diluted common share:
Basic and diluted net loss per common share	$ 0
Assets
Accounts receivable, net	$ 614		3,336
Inventories	(367)		(62)
Assets			3,274
Liabilities
Other accrued expenses	186		918
Accumulated deficit	$ (62)		2,356
Liabilities And Stockholders Equity			$ 3,274

Financial Instruments and Fai34

Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Assets at fair value	$ 384,256	$ 532,669
Money market
Fair Value Measurements
Assets at fair value	294,559	433,136
U.S. treasury securities
Fair Value Measurements
Assets at fair value	89,697	99,533
Fair Value, Inputs, Level 1
Fair Value Measurements
Assets at fair value	294,559	433,136
Fair Value, Inputs, Level 1 | Money market
Fair Value Measurements
Assets at fair value	294,559	433,136
Fair Value, Inputs, Level 1 | U.S. treasury securities
Fair Value Measurements
Assets at fair value	0	0
Fair Value, Inputs, Level 2
Fair Value Measurements
Assets at fair value	89,697	99,533
Fair Value, Inputs, Level 2 | Money market
Fair Value Measurements
Assets at fair value	0	0
Fair Value, Inputs, Level 2 | U.S. treasury securities
Fair Value Measurements
Assets at fair value	89,697	99,533
Fair Value, Inputs, Level 3
Fair Value Measurements
Assets at fair value	0	0
Fair Value, Inputs, Level 3 | Money market
Fair Value Measurements
Assets at fair value	0	0
Fair Value, Inputs, Level 3 | U.S. treasury securities
Fair Value Measurements
Assets at fair value	$ 0	$ 0

Financial Instruments and Fai35

Financial Instruments and Fair Value Measurements - More Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Transfers between level 1 and level 2, assets	$ 0
Transfers between level 2 and level 1, assets	0
Transfers between level 1 and level 2, liabilities	0
Transfers between level 2 and level 1, liabilities	0
Transfer of assets into level 3	0
Transfer of assets out of level 3	0
Transfer of liabilities into level 3	0
Transfer of liabilities out of level 3	0
Convertible senior notes	282,732	$ 282,406
Convertible Senior Notes.
Fair Value Measurements
Convertible senior notes	282,700
Convertible Senior Notes. | Fair Value, Inputs, Level 2
Fair Value Measurements
Convertible senior notes, fair value	$ 335,500

Available-for-Sale Securities36

Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Available-for-Sale Securities
Amortized Cost	$ 89,821
Aggregate Fair Value	$ 89,697
Maximum number of months available-for-sale securities in a continuous unrealized loss position	12 months
Available for sale securities in a continuous unrealized loss position
Available-for-Sale Securities
Available-for-sale securities	$ 0
U.S. treasury securities
Available-for-Sale Securities
Amortized Cost	89,821	$ 99,650
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(124)	(117)
Aggregate Fair Value	$ 89,697	$ 99,533

Available-for-Sale Securities -

Available-for-Sale Securities - Additional Information (Details) $ in Thousands	Mar. 31, 2018USD ($)
Available-for-Sale Securities
Amortized Cost, Due in one year or less	$ 89,821
Amortized Cost, Due in one year to two years	0
Amortized Cost	89,821
Fair Value, Due in one year or less	89,697
Fair Value, Due in one year to two years	0
Aggregate Fair Value	$ 89,697

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventories
Work-in-process	$ 67,437		$ 24,721
Finished goods	1,755		2,787
Total inventories	69,192	$ 27,446	$ 27,508
Cash Deposit To Manufacturer For Non Current Inventory	$ 9,303
Maximum number of months purchased inventory converted to finished goods	12 months

Other Current Assets (Details)

Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Current Assets
Prepaid Insurance	$ 1,427	$ 1,926
Prepaid expenses - other	5,684	3,355
Receivable - other	1,780	2,023
Other	224	196
Total	$ 9,115	$ 7,500

Intangible Assets and Goodwil40

Intangible Assets and Goodwill (Details) - Licensing Agreements - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Intangible asset - milestones	$ 21,100	$ 21,100
Accumulated amortization	(1,911)	(1,539)
Total intangible asset, net	$ 19,189	$ 19,561

Intangible Assets and Goodwil41

Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Licensing Agreements
Finite Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 0.4	$ 0.4

Intangible Assets and Goodwil42

Intangible Assets and Goodwill - Estimated Future Amortization (Details) - Licensing Agreements - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets
2,018	$ 1,114
2,019	1,486
2,020	1,486
2,021	1,486
2,022	1,486
Thereafter	12,131
Total intangible asset, net	$ 19,189	$ 19,561

Intangible Assets and Goodwil43

Intangible Assets and Goodwill - Summary of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill:
Balance at beginning of period	$ 65,217
Balance at end of period	66,960
Ethical Oncology Science, S.p.A.
Goodwill:
Balance at beginning of period	65,217
Change in foreign currency gains and losses	1,743
Balance at end of period	$ 66,960

Other Accrued Expenses (Details

Other Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Accrued Expenses
Accrued personnel costs	$ 7,381		$ 13,889
Accrued interest payable	299		2,096
Income tax payable	45
Accrued corporate legal fees and professional services	137		415
Accrued royalties	4,025		2,984
Accrued variable considerations	1,391		1,008
Payable to third party logistics provider	2,661		2,661
Accrued legal settlement cost	7,975
Accrued expenses - other	3,392		2,830
Total	$ 27,306	$ 26,801	$ 25,883

Convertible Senior Notes (Detai

Convertible Senior Notes (Details) $ / shares in Units, $ in Millions	Sep. 09, 2014USD ($)Ditem$ / shares	Apr. 30, 2018USD ($)	Mar. 31, 2018USD ($)item	Dec. 31, 2017USD ($)
Subsequent Event
Debt Instrument
Aggregate principal amount of public offering		$ 300
Convertible senior notes, interest rate		1.25%
Net proceeds from convertible senior notes		$ 292
Convertible Senior Notes.
Debt Instrument
Aggregate principal amount of public offering	$ 287.5
Convertible senior notes, interest rate	2.50%
Net proceeds from convertible senior notes	$ 278.3
Convertible senior notes, maturity date			Sep. 15, 2021
Common stock initial conversion rate per $1,000 in principal amount	16.1616
Convertible senior notes, initial conversion price per share | $ / shares	$ 61.88
Debt instrument, redemption period start date			Sep. 15, 2018
Last reported sale price of common stock	150.00%
Debt instrument, conversion in effect for number of trading days | item	20
Debt instrument conversion, consecutive trading day period | D	30
Debt instrument, trading days preceding redemption notice, maximum | item			2
Debt instrument redemption price percentage to principal amount	100.00%
Debt instrument repurchase percentage			100.00%
Debt issuance costs	$ 9.2
Debt instrument term			7 years
Unamortized debt issuance costs			$ 4.8	$ 5.1
Convertible Senior Notes. | Semi Annual Payment, First payment date
Debt Instrument
Interest payment date on senior notes			--03-15
Convertible Senior Notes. | Semi Annual Payment, Second payment date
Debt Instrument
Interest payment date on senior notes			--09-15

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Convertible Senior Notes
Contractual interest expense	$ 1,797	$ 1,797
Accretion of interest on milestone liability	512	467
Amortization of debt issuance costs	326	317
Total interest expense	$ 2,635	$ 2,581

Stockholders' Equity (Details)

Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2018USD ($)$ / sharesshares	Mar. 31, 2018Vote	Mar. 31, 2017USD ($)
Class Of Stock [Line Items]
Proceeds from the sale of common stock, net of issuance costs			$ 221,224
Number Of Vote Per Common Stock | Vote		1
Subsequent Event
Class Of Stock [Line Items]
Common stock, shares issued | shares	1,837,898
Sale of stock, price per share | $ / shares	$ 54.41
Proceeds from the sale of common stock, net of issuance costs	$ 94,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Loss
Beginning balance	$ (42,173)	$ (47,580)
Other comprehensive income (loss)	1,984	730
Total before tax	(40,189)	(46,850)
Tax effect	(472)	(268)
Ending balance	(40,661)	(47,118)
Reclassifications out of accumulated other comprehensive loss	0	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Beginning balance	(41,917)	(47,434)
Other comprehensive income (loss)	1,991	735
Total before tax	(39,926)	(46,699)
Tax effect	(474)	(268)
Ending balance	(40,400)	(46,967)
Unrealized (Losses) Gains
Accumulated Other Comprehensive Loss
Beginning balance	(256)	(146)
Other comprehensive income (loss)	(7)	(5)
Total before tax	(263)	(151)
Tax effect	2	0
Ending balance	$ (261)	$ (151)

Share-Based Compensation (Detai

Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 29, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	$ 11,913	$ 8,947
Employee Service Share Based Compensation Tax Benefit From Compensation Expense	0	0
Closing Stock Price			$ 52.80
Research and development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	5,376	4,167
Selling, general and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense	6,537	$ 4,780
Common shares under option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to unvested RSUs	$ 75,300
Unrecognized stock-based compensation expense related to non-vested options and RSUs, weighted-average remaining vesting period	2 years 7 months 24 days
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to unvested RSUs	$ 32,300
Unrecognized stock-based compensation expense related to non-vested options and RSUs, weighted-average remaining vesting period	3 years 4 months 24 days

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Stock Options Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / sharesshares
Share-Based Compensation
Beginning Balance, Number of Options Outstanding | shares	5,789,735
Number of Options, Granted | shares	384,518
Number of Options, Exercised | shares	(21,431)
Number of Options, Forfeited | shares	(49,420)
Ending Balance, Number of Options Outstanding | shares	6,103,402
Number of Options, Vested and expected to vest at March 31,2018 | shares	5,805,355
Number of Options, Vested and exercisable at March 31,2018 | shares	3,861,586
Beginning Balance, Weighted Average Exercise Price | $ / shares	$ 46.77
Granted, Weighted Average Exercise Price | $ / shares	58.47
Exercised, Weighted Average Exercise Price | $ / shares	23.96
Forfeited, Weighted Average Exercise Price | $ / shares	67.03
Ending Balance, Weighted Average Exercise Price | $ / shares	47.42
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	47.12
Vested and exercisable, Weighted Average Exercise Price | $ / shares	$ 44.56
Outstanding, Weighted Average Remaining Contractual Term (Years)	7 years
Vested and expected to vest, Weighted Average Remaining Contractual Term (Years)	6 years 10 months 24 days
Exercisable, Weighted Average Remaining Contractual Term (Years)	6 years
Outstanding at March 31, 2018, Aggregate Intrinsic Value | $	$ 91,682
Vested and expected to vest at March 31, 2018, Aggregate Intrinsic Value | $	89,099
Vested and exercisable at March 31, 2018, Aggregate Intrinsic Value | $	$ 69,360

Share-Based Compensation - Sche

Share-Based Compensation - Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-Based Compensation
Weighted-average grant date fair value per share	$ 43.14	$ 47.71
Intrinsic value of options exercised	$ 762	$ 9,525
Cash received from stock option exercises	$ 514	$ 5,674

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested as of Beginning Balance | shares	589,529
Number of Units, Granted | shares	360,688
Number of Units, Vested | shares	(110,889)
Number of Units, Forfeited | shares	(9,746)
Unvested as of Ending Balance | shares	829,582
Number of Units, Expected to vest after March 31, 2018 | shares	695,398
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 41.67
Weighted Average Grant Date Fair Value, Granted | $ / shares	58.47
Weighted Average Grant Date Fair Value, Vested | $ / shares	40
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	37.31
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	49.25
Weighted Average Grant Date Fair Value, Expected to vest after March 31, 2018 | $ / shares	$ 48.78

License Agreements (Details)

License Agreements (Details) $ in Thousands	Dec. 19, 2016item	Apr. 30, 2018USD ($)	Jun. 30, 2011USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
License Agreements
Minimum number of chemotherapies | item	2
Rucaparib | First approval of NDA by FDA | Subsequent Event
License Agreements
Milestone payments		$ 15,000
License Agreements Licensor Pfizer | Rucaparib
License Agreements
Milestone payments					$ 750
Milestone payment due prior to deferment of milestone payment				$ 20,000
Deferred milestone payment				$ 23,000
Maximum number of months after FDA approval				18 months
License Agreements Licensor Pfizer | Rucaparib | Minimum
License Agreements
Annual sales target for sales milestone payments				$ 250,000
License Agreements Licensor Pfizer | Rucaparib | Maximum
License Agreements
Maximum potential future development, regulatory milestone payments				51,750
Additional maximum payments payable on attaining the sales target				$ 170,000
License Agreement Terms | License Agreements Licensor Pfizer | Rucaparib
License Agreements
Upfront payment			$ 7,000
Milestones paid to Pfizer prior to FDA approval			$ 1,400

Net Loss Per Common Share (Deta

Net Loss Per Common Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Total potential dilutive shares	8,554	8,203
Common shares under option
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Total potential dilutive shares	3,908	3,557
Convertible senior notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Total potential dilutive shares	4,646	4,646

Commitments and Contingencies (

Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017shareholder	Dec. 31, 2017USD ($)
Deferred Long-term Liability Charges	$ 22,534,000		$ 22,022,000
Purchase commitment	$ 197,300,000
Number of purported shareholders | shareholder		2
Maximum
Maximum number of business days to answer allegations	20 days
Litigation Settlement, Expense	$ 395,000
Board Of Directors
Officers' Compensation	$ 400,000
Number of years compensation agreement in place	3 years
New Directors
Officers' Compensation	$ 600,000
Number of years compensation agreement in place	3 years