pre_text: abiomed , inc . and subsidiaries notes to consolidated financial statements 2014 ( continued ) note 14 . income taxes ( continued ) on april 1 , 2007 , the company adopted financial interpretation fin no . 48 , accounting for uncertainty in income taxes 2014an interpretation of fasb statement no . 109 ( 201cfin no . 48 201d ) , which clarifies the accounting for uncertainty in income taxes recognized in an enterprise 2019s financial statements in accordance with fasb statement no . 109 , accounting for income taxes . fin no . 48 prescribes a recognition threshold and measurement process for recording in the financial statements uncertain tax positions taken or expected to be taken in a tax return . fin no . 48 also provides guidance on derecognition , classification , interest and penalties , accounting in interim periods , disclosure , and transition and defines the criteria that must be met for the benefits of a tax position to be recognized . as a result of its adoption of fin no . 48 , the company recorded the cumulative effect of the change in accounting principle of $ 0.3 million as a decrease to opening retained earnings and an increase to other long-term liabilities as of april 1 , 2007 . this adjustment related to state nexus for failure to file tax returns in various states for the years ended march 31 , 2003 , 2004 , and 2005 . the company initiated a voluntary disclosure plan , which it completed in fiscal year 2009 . the company elected to recognize interest and/or penalties related to income tax matters in income tax expense in its consolidated statements of operations . as of march 31 , 2009 , the company had remitted all outstanding amounts owed to each of the states in connection with the outstanding taxes owed at march 31 , 2008 . as such , the company had no fin no . 48 liability at march 31 , 2009 . on a quarterly basis , the company accrues for the effects of uncertain tax positions and the related potential penalties and interest . it is reasonably possible that the amount of the unrecognized tax benefit with respect to certain of the unrecognized tax positions will increase or decrease during the next 12 months ; however , it is not expected that the change will have a significant effect on the company 2019s results of operations or financial position . a reconciliation of the beginning and ending balance of unrecognized tax benefits , excluding accrued interest recorded at march 31 , 2009 ( in thousands ) is as follows: .
post_text: the company and its subsidiaries are subject to u.s . federal income tax , as well as income tax of multiple state and foreign jurisdictions . the company has accumulated significant losses since its inception in 1981 . all tax years remain subject to examination by major tax jurisdictions , including the federal government and the commonwealth of massachusetts . however , since the company has net operating loss and tax credit carry forwards which may be utilized in future years to offset taxable income , those years may also be subject to review by relevant taxing authorities if the carry forwards are utilized . note 15 . commitments and contingencies the company 2019s acquisition of impella provided that abiomed was required to make contingent payments to impella 2019s former shareholders as follows : 2022 upon fda approval of the impella 2.5 device , a payment of $ 5583333 2022 upon fda approval of the impella 5.0 device , a payment of $ 5583333 , and 2022 upon the sale of 1000 units of impella 2019s products worldwide , a payment of $ 5583334 . the two milestones related to sales and fda approval of the impella 2.5 device were achieved and paid prior to march 31 , 2009 . in april 2009 , the company received fda 510 ( k ) clearance of its impella 5.0 product , triggering an obligation to pay the milestone related to the impella 5.0 device . in may 2009 , the company paid $ 1.8 million of this final milestone in cash and elected to pay the remaining amount through the issuance of approximately 664612 shares of common stock. .
table: Balance at March 31, 2008 $168
table: Reductions for tax positions for closing of the applicable statute of limitations (168)
table: Balance at March 31, 2009 $—
question: Analyse this data from a financial earnings document. what portion of the last payment for the final milestone was paid through the issuance of common stock?