Description of Business, Basis of Presentation, and Operating Segment (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and with the rules and regulations of the United States Securities and Exchange Commission (“SEC”). These financial statements include the financial position, results of operations and cash flows of the Company, including its subsidiaries, all of which are wholly-owned. All inter-company accounts and transactions have been eliminated in consolidation. For the three months ended March 31, 2020 and 2019, there were no related party transactions. The Company adopted Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-15, Presentation of Financial Statements - (Subtopic 205-40) effective December 31, 2016, which requires the Company to make certain disclosures if it concludes that there is substantial doubt about the entity’s ability to continue as a going concern within 12 months from the date of the issuance of these financial statements. The Company has a history of recurring losses from operations, recurring cash flow losses, and a net capital deficiency. Further, during the three months ended March 31, 2020, the COVID-19 pandemic had a negative impact on the Company’s financial results and business operations, and the Company expects that financial results and business operations will continue to be negatively impacted by the pandemic. As a result, the Company believes that its existing liquidity will not be sufficient to meet anticipated cash needs for at least the next 12 months from the issuance date of these financial statements, thereby raising substantial doubt about the Company’s ability to continue as a going concern. The consolidated financial statements included herein have been prepared on a going concern basis, which contemplates continuity of operations and the realization of assets and the repayment of liabilities in the ordinary course of business. The Company has not made any adjustments to the accompanying consolidated financial statements related to the recoverability and classification of recorded asset amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern. The Company will require additional capital to sustain its operations and make the investments it needs to execute upon its business plan. If the Company is unable to generate sufficient revenue from its existing business plan, the Company will need to obtain additional equity or debt financing. If the Company attempts to obtain additional debt or equity financing, the Company cannot assume that such financing will be available on favorable terms, if at all. Additionally, due to the substantial doubt about the Company’s ability to continue operating as a going concern, the Company is in default under the Facility Agreement and Credit Agreement with its lender, Deerfield. We have entered into forbearance agreements with Deerfield which provide that Deerfield will not exercise its default rights under the Facility Agreements until June 15, 2020 or earlier upon certain conditions. If Deerfield were to exercise its default rights, such default would result in a cross default under the Company’s 5.00% Notes and 2020 5.00% Voluntary Notes. If Deerfield were to exercise its default rights, other lenders may then declare a default and the Company may be unable to repay the amounts owed without raising additional capital. If the Company is unable to repay the amounts owed, it may be forced to declare bankruptcy. Therefore, the entire amount of borrowings of $135.6 million from Deerfield and the $32.1 million 5% Notes and 2020 5.00% Voluntary Notes as at March 31, 2020 have been classified as current in these financial statements. Further, the Company would be required to pay exit fees totaling $11.1 million under the Facility Agreement and the remaining $0.1 million commitment fee under the Credit Agreement. Deerfield has not declared a default. The interim financial data as of March 31, 2020 is unaudited and is not necessarily indicative of the results for a full year. In the opinion of the Company’s management, the interim data includes normal and recurring adjustments necessary for a fair presentation of the Company’s financial results for the three months ended March 31, 2020. Certain information and disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to SEC rules and regulations relating to interim financial statements. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Company’s audited Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed with the SEC on March 11, 2020 (the “Annual Report”).
Operating Segment	Operating Segment The Company has one operating and reporting segment that is focused exclusively on the development, manufacture, marketing and sale of EVAR and EVAS products for the treatment of aortic disorders. For the three months ended March 31, 2020, all of the Company’s revenue and related expenses were solely attributable to these activities. Substantially all of the Company’s long-lived assets are located in the United States.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenue and expenses, and the related disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the periods presented. Management evaluates its estimates on an ongoing basis, including those related to: (i) collectibility of customer accounts; (ii) whether the cost of inventories can be recovered; (iii) the value of goodwill and intangible assets; (iv) realization of tax assets and estimates of tax liabilities; (v) likelihood of payment and the value of contingent liabilities; and (vi) the potential outcome of litigation. Such estimates are based on management’s judgment which takes into account historical experience and various assumptions. Nonetheless, actual results may differ from management’s estimates.
Leases	All facility leases are accounted for as operating leases. A right-of-use asset, representing the underlying asset during the lease term, and a lease liability, representing the payment obligation arising from the lease, are recognized on the balance sheet at lease commencement based on the present value of the payment obligation. For operating leases, expense is recognized on a straight-line basis over the lease term. Short-term leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company primarily uses its incremental borrowing rate in determining the present value of lease payments as the Company's facility leases generally do not provide an implicit rate.