Description of Business, Basis of Presentation, and Operating Segment (Policies)	6 Months Ended
	Jun. 30, 2019
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 and six months ended June 30, 2019 and 2018, there were no related party transactions. The interim financial data as of June 30, 2019 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 and six months ended June 30, 2019. 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, 2018, filed with the SEC on April 1, 2019
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 and six months ended June 30, 2019, 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. (d) Reverse Stock Split At a special meeting of stockholders held on February 22, 2019, the Company’s stockholders approved a proposal to amend the Amended and Restated Certificate of Incorporation, as amended, to effect a reverse stock split of the Company’s issued and outstanding common stock at a ratio not less than 1-for-5 and not greater than 1-for-10 (inclusive), with the exact ratio to be set as a whole number within that range at the discretion of the board of directors before February 22, 2020 without further approval or authorization of our stockholders. On February 26, 2019, the Company’s board of directors approved the reverse stock split at a ratio of 1-for-10. On March 5, 2019, the Company filed a Certificate of Amendment of Amended and Restated Certificate of Incorporation, as Amended, with the Secretary of State of the State of Delaware to effect the reverse stock split. Unless stated otherwise, all share and per share amounts in this Quarterly Report on Form 10-Q for the fiscal period ended June 30, 2019 have been retroactively adjusted to reflect the reverse stock split.
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.