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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

The accompanying unaudited condensed consolidated financial statements include the amounts of Portola, its wholly-owned subsidiaries and a development partner that is a variable interest entity (a “VIE”) for which Portola is deemed, under applicable accounting guidance, to be the primary beneficiary as of March 31, 2019. The unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”), and follow the requirements of the Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP has been condensed or omitted. These condensed consolidated financial statements have been prepared on the same basis as our annual consolidated financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments that are necessary for a fair statement of our financial information. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended December 31, 2018 included in our Annual Report on Form 10-K filed on March 1, 2019 with the SEC.

The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019 or for any other interim period or for any other future year. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements at that date but does not include all of the information required by U.S. GAAP for complete financial statements.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities and the reported amounts of revenues and expenses in the condensed consolidated financial statements and the accompanying notes. On an ongoing basis, we evaluate our significant accounting policies and estimates. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from those estimates.

Cash as Reported in Condensed Consolidated Statements of Cash Flows

Cash as reported in the condensed consolidated statements of cash flows includes the aggregate amounts of cash and cash equivalents and restricted cash. Restricted cash consists of cash restricted for royalty payments to HealthCare Royalty Partners and its Affiliates (“HCR”) and cash held by SRX Cardio, LLC (“SRX Cardio”). Cash as reported in the condensed consolidated statements of cash flows consists of the following (in thousands):

	March 31, 2019		December 31, 2018
Cash and cash equivalents	$	226,793	$	138,951
Restricted cash (SRX Cardio)		29		30
Restricted cash for royalty payments to HealthCare Royalty Partners and its affiliates ("HCR")		1,499		1,032
Total cash balance in condensed consolidated statements of cash flows	$	228,321	$	140,013

Customer Concentration

We have four Andexxa specialty distributor customers who each accounted for 10% or more of total net revenues during the three months ended March 31, 2019. We have three collaboration revenue customers who each accounted for less than 10% of total net revenues during the three months ended March 31, 2019. Each of these collaboration revenue customers accounted for more than 10% of total net revenues during the three months ended March 31, 2018.

Recent Accounting Pronouncements Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842), which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use (“ROU”) asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). This new standard is effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within those annual reporting periods, with early adoption permitted. We adopted this new standard effective January 1, 2019 using the optional transition method, which allows us to recognize a cumulative-effect adjustment to the opening balance of accumulated deficit at the date of adoption and apply the new disclosure requirements beginning in the period of adoption. Our adoption of the standard added approximately $2.1 million in ROU assets and $3.3 million in lease liabilities to our condensed consolidated balance sheet upon adoption and did not significantly impact financial results.

The new standard provides a number of optional practical expedients and we elected the following:

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Transition Elections. We elected the package of practical expedients that permits us to not reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We also elected the practical expedient to not separate lease and non-lease components for facility lease classes of underlying assets to new or modified leases beginning on or after the adoption date. That is, we will account for each separate lease component of a contract and its associated non-lease components as a single lease component.

•	Ongoing Accounting Policy Elections. We elected the short-term lease recognition exemption whereby ROU assets and lease liabilities will not be recognized for leasing arrangements with terms less than one year.

In June 2018, the FASB issued ASU No. 2018-07, Stock-based Compensation: Improvements to Nonemployee Share-based Payment Accounting, which amends the existing accounting standards for share-based payments to nonemployees. This ASU aligns much of the guidance on measuring and classifying nonemployee awards with that of awards to employees. Under the new guidance, the measurement of nonemployee equity awards is fixed on the grant date. This ASU becomes effective in the first quarter of fiscal year 2019 and early adoption is permitted but no earlier than an entity’s adoption date of Topic 606. Entities will apply this ASU by recognizing a cumulative-effect adjustment to retained earnings as of the beginning of the annual period of adoption. We adopted this new standard effective January 1, 2019. Adoption of this standard did not result in an adjustment to our beginning accumulated deficit upon the adoption, and did not significantly impact our financial results.

Recent Accounting Pronouncements Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326). This ASU implements an impairment model, known as the current expected credit loss model that is based on expected losses rather than incurred losses. For trade receivables, entities will be required to estimate lifetime expected credit losses. This could result in the earlier recognition of credit losses. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than an other-than-temporary impairment that reduces the cost basis of the investment. Further, an entity will recognize any improvements in estimated credit losses immediately in earnings. Under the current guidance, a recovery of an impairment loss on an available-for-sale debt security is recognized prospectively as interest income. This ASU is effective for all interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. We are in the process of assessing the impact of ASU 2016-13 on our condensed consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. Accordingly, this ASU requires a customer in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. This ASU is effective for us for all interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. We are in the process of assessing the impact of ASU 2018-15 on our condensed consolidated financial statements.