97% ( 97 % ) of its carrying value . the columbia fund is being liquidated with distributions to us occurring and expected to be fully liquidated during calendar 2008 . since december 2007 , we have received disbursements of approximately $ 20.7 million from the columbia fund . our operating activities during the year ended march 31 , 2008 used cash of $ 28.9 million as compared to $ 19.8 million during the same period in the prior year . our fiscal 2008 net loss of $ 40.9 million was the primary cause of our cash use from operations , attributed to increased investments in our global distribution as we continue to drive initiatives to increase recovery awareness as well as our investments in research and development to broaden our circulatory care product portfolio . in addition , our inventories used cash of $ 11.1 million during fiscal 2008 , reflecting our inventory build-up to support anticipated increases in global demand for our products and our accounts receivable also increased as a result of higher sales volume resulting in a use of cash of $ 2.8 million in fiscal 2008 . these decreases in cash were partially offset by an increase in accounts payable and accrued expenses of $ 5.6 million , non-cash adjustments of $ 5.4 million related to stock-based compensation expense , $ 6.1 million of depreciation and amortization and $ 5.0 million for the change in fair value of worldheart note receivable and warrant . our investing activities during the year ended march 31 , 2008 used cash of $ 40.9 million as compared to cash provided by investing activities of $ 15.1 million during the year ended march 31 , 2007 . cash used by investment activities for fiscal 2008 consisted primarily of $ 49.3 million for the recharacterization of the columbia fund to short-term marketable securities , $ 17.1 million for the purchase of short-term marketable securities , $ 3.8 million related to expenditures for property and equipment and $ 5.0 million for note receivable advanced to worldheart . these amounts were offset by $ 34.5 million of proceeds from short-term marketable securities . in june 2008 , we received 510 ( k ) clearance of our impella 2.5 , triggering an obligation to pay $ 5.6 million of contingent payments in accordance with the may 2005 acquisition of impella . these contingent payments may be made , at our option , with cash , or stock or by a combination of cash or stock under circumstances described in the purchase agreement . it is our intent to satisfy this contingent payment through the issuance of shares of our common stock . our financing activities during the year ended march 31 , 2008 provided cash of $ 2.1 million as compared to cash provided by financing activities of $ 66.6 million during the same period in the prior year . cash provided by financing activities for fiscal 2008 is comprised primarily of $ 2.8 million attributable to the exercise of stock options , $ 0.9 million related to the proceeds from the issuance of common stock , $ 0.3 million related to proceeds from the employee stock purchase plan , partially offset by $ 1.9 million related to the repurchase of warrants . the $ 64.5 million decrease compared to the prior year is primarily due to $ 63.6 million raised from the public offering in fiscal 2007 . we disbursed approximately $ 2.2 million of cash for the warrant repurchase and settlement of certain litigation . capital expenditures for fiscal 2009 are estimated to be approximately $ 3.0 to $ 6.0 million . contractual obligations and commercial commitments the following table summarizes our contractual obligations at march 31 , 2008 and the effects such obligations are expected to have on our liquidity and cash flows in future periods . payments due by fiscal year ( in $ 000 2019s ) contractual obligations total than 1 than 5 .
what portion of total obligations is related to operating lease commitments as of march 31 , 2008?
we have no long-term debt , capital leases or other material commitments , for open purchase orders and clinical trial agreements at march 31 , 2008 other than those shown in the table above . in may 2005 , we acquired all the shares of outstanding capital stock of impella cardiosystems ag , a company headquartered in aachen , germany . the aggregate purchase price excluding a contingent payment in the amount of $ 5.6 million made on january 30 , 2007 in the form of common stock , was approximately $ 45.1 million , which consisted of $ 42.2 million of our common stock , $ 1.6 million of cash paid to certain former shareholders of impella and $ 1.3 million of transaction costs , consisting primarily of fees paid for financial advisory and legal services . we may make additional contingent payments to impella 2019s former shareholders based on additional milestone payments related to fda approvals in the amount of up to $ 11.2 million . in june 2008 we received 510 ( k ) clearance of our impella 2.5 , triggering an obligation to pay $ 5.6 million of contingent payments . these contingent payments may be made , at our option , with cash , or stock or by a combination of cash or stock under circumstances described in the purchase agreement , except that approximately $ 1.8 million of these contingent payments must be made in cash . the payment of any contingent payments will result in an increase to the carrying value of goodwill . we apply the disclosure provisions of fin no . 45 , guarantor 2019s accounting and disclosure requirements for guarantees , including guarantees of indebtedness of others , and interpretation of fasb statements no . 5 , 57 and 107 and rescission of fasb interpretation .