Basis of Presentation	3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Note 1. Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements for HeartWare International, Inc. (“we,” “our,” “us,” “HeartWare,” the “HeartWare Group” or the “Company”) have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for reporting of interim financial information. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted. Accordingly, these statements do not include all the disclosures normally required by U.S. GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the audited financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014. The accompanying condensed consolidated balance sheet as of December 31, 2014 has been derived from our audited financial statements. The unaudited condensed consolidated statements of operations and cash flows for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for any future period or for the year ending December 31, 2015. The preparation of our unaudited interim 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, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates. In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of only normally recurring adjustments) necessary to present fairly the financial position and results of operations as of the dates and for the periods presented. *New Accounting Standards* In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). The updated standard is a new comprehensive revenue recognition model that requires revenue to be recognized in a manner that depicts the transfer of goods or services to a customer at an amount that reflects the consideration expected to be received in exchange for those goods or services. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is not permitted. The updated standard becomes effective for us in the first quarter of our fiscal year ending December 31, 2017. We have not yet selected a transition method, and we are currently evaluating the effect that the ASU 2014-09 will have on our consolidated financial statements and related disclosures. In April 2015, the FASB issued for public comment a proposed update that would defer the effective date of ASU 2014-09 by one year. If the one-year deferral is adopted, ASU 2014-09 would become effective for us in the first quarter of our fiscal year ending December 31, 2018. In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which is intended to improve targeted areas of consolidation guidance for legal entities such as limited partnerships, limited liability corporations, and securitization structures (collateralized debt obligations, collateralized loan obligations, and mortgage-backed security transactions). This ASU focuses on the consolidation evaluation for reporting organizations (public and private companies and not-for-profit organizations) that are required to evaluate whether they should consolidate certain legal entities. In addition to reducing the number of consolidation models from four to two, the new standard simplifies the FASB Accounting Standards Codification by: i) placing more emphasis on risk of loss when determining a controlling financial interest; ii) reducing the frequency of the application of related-party guidance when determining a controlling financial interest in a variable interest entity (“VIE”); and iii) changing consolidation conclusions for public and private companies in several industries that typically make use of limited partnerships or VIEs. ASU No. 2015-02 will be effective for us in periods beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. The adoption of ASU No. 2015-02 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows. In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated standard requires debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 will be effective for us in periods beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. ASU 2015-03 should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The adoption of ASU No. 2015-03 will result in the reclassification of debt issuance costs currently classified in long-term assets to be offset against the carrying value of our convertible notes. Based on the amount of debt issuance costs included in long-term assets as of March 31, 2015, the adoption of ASU 2015-03 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows.

Note 1. Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements for HeartWare International, Inc. (“we,” “our,” “us,” “HeartWare,” the “HeartWare Group” or the “Company”) have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for reporting of interim financial information. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted. Accordingly, these statements do not include all the disclosures normally required by U.S. GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the audited financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014. The accompanying condensed consolidated balance sheet as of December 31, 2014 has been derived from our audited financial statements. The unaudited condensed consolidated statements of operations and cash flows for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for any future period or for the year ending December 31, 2015.

The preparation of our unaudited interim 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, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of only normally recurring adjustments) necessary to present fairly the financial position and results of operations as of the dates and for the periods presented.

New Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). The updated standard is a new comprehensive revenue recognition model that requires revenue to be recognized in a manner that depicts the transfer of goods or services to a customer at an amount that reflects the consideration expected to be received in exchange for those goods or services. ASU 2014-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is not permitted. The updated standard becomes effective for us in the first quarter of our fiscal year ending December 31, 2017. We have not yet selected a transition method, and we are currently evaluating the effect that the ASU 2014-09 will have on our consolidated financial statements and related disclosures. In April 2015, the FASB issued for public comment a proposed update that would defer the effective date of ASU 2014-09 by one year. If the one-year deferral is adopted, ASU 2014-09 would become effective for us in the first quarter of our fiscal year ending December 31, 2018.

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, which is intended to improve targeted areas of consolidation guidance for legal entities such as limited partnerships, limited liability corporations, and securitization structures (collateralized debt obligations, collateralized loan obligations, and mortgage-backed security transactions). This ASU focuses on the consolidation evaluation for reporting organizations (public and private companies and not-for-profit organizations) that are required to evaluate whether they should consolidate certain legal entities. In addition to reducing the number of consolidation models from four to two, the new standard simplifies the FASB Accounting Standards Codification by: i) placing more emphasis on risk of loss when determining a controlling financial interest; ii) reducing the frequency of the application of related-party guidance when determining a controlling financial interest in a variable interest entity (“VIE”); and iii) changing consolidation conclusions for public and private companies in several industries that typically make use of limited partnerships or VIEs. ASU No. 2015-02 will be effective for us in periods beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. The adoption of ASU No. 2015-02 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows.

In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The updated standard requires debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 will be effective for us in periods beginning after December 15, 2015. Early adoption is permitted

for financial statements that have not been previously issued. ASU 2015-03 should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The adoption of ASU No. 2015-03 will result in the reclassification of debt issuance costs currently classified in long-term assets to be offset against the carrying value of our convertible notes. Based on the amount of debt issuance costs included in long-term assets as of March 31, 2015, the adoption of ASU 2015-03 is not expected to have a material effect on our consolidated financial position, results of operations or cash flows.