Contingently Issuable Common Stock	6 Months Ended
Jun. 30, 2019
Business Combinations [Abstract]
Contingently Issuable Common Stock	Contingently Issuable Common Stock On October 27, 2010, the Company entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”) with Nepal Acquisition Corporation, a wholly-owned subsidiary of the Company, Nellix, Inc. (“Nellix”), certain of Nellix’s stockholders named therein and Essex Woodlands Health Ventures, Inc., as representative of the former Nellix stockholders. On December 10, 2010 (the “Nellix Closing Date”), the Company completed its acquisition of Nellix. The purchase price consisted of shares of the Company’s common stock issuable as of the Nellix Closing Date. Additional payments, solely in the form of shares of the Company’s common stock will be made upon the achievement of a revenue milestone and a regulatory approval milestone (collectively, the “Nellix Milestones”). Under the Merger Agreement, the ultimate value of the contingently issuable common stock would be determined on the date that each Nellix Milestone is achieved. The number of issuable shares would be established using an applicable per share price, which is subject to a ceiling and/or floor, resulting at the closing of the merger in a potential maximum of approximately 1,020,000 shares issuable upon the achievement of the Nellix Milestones. As of the Closing Date, the fair value of the contingently issuable common stock was estimated to be $28.2 million. The Merger Agreement provides that, in addition to the shares of common stock of the Company issued to the former Nellix stockholders at the Nellix Closing Date, if the Company receives approval from the FDA to sell one of Nellix’s products in the United States (the “PMA Milestone”), the Company will issue additional shares of its common stock to the former stockholders of Nellix. The dollar value of the shares of the Company’s common stock to be issued upon achievement of the PMA Milestone will be equal to $15.0 million (less the dollar value of certain cash payments and other deductions). The price per share of the shares of the Company’s common stock to be issued upon achievement of the PMA Milestone is subject to a stock price floor of $45.00 per share but not subject to a stock price ceiling. The value of the contingently issuable common stock is derived using a discounted income approach model, with a range of probabilities and assumptions related to the timing and likelihood of achievement of the PMA Milestone (which include Level 3 inputs and the Company’s stock price (Level 1 input) as of the balance sheet date). These varying probabilities and assumptions and changes in the Company’s stock price have required fair value adjustments of the contingently issuable common stock in periods subsequent to the Nellix Closing Date. The fair value of the contingently issuable common stock will continue to be evaluated on a quarterly basis until milestone achievement occurs, or until the expiration of the “Earn-Out Period,” as defined within the Nellix Merger Agreement. Adjustments to the fair value of the contingently issuable common stock are recognized within other income (expense), net in the Condensed Consolidated Statements of Operations and Comprehensive Loss. See the “Fair Value Measurements” section of Note 3 for further details. As of June 30, 2019, the fair value of the contingently issuable common stock was presented in non-current liabilities. At June 30, 2019 the Company’s stock price closed at $7.24 per share. Thus, had the PMA Milestone been achieved on June 30, 2019 the contingently issuable common stock would have comprised approximately 333,149 shares (based on the 30-day average closing stock price ending 5 days prior to the announcement, subjected to the stock price floor of $45.00 per share), representing a value of $2.3 million.

Contingently Issuable Common Stock

On October 27, 2010, the Company entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”) with Nepal Acquisition Corporation, a wholly-owned subsidiary of the Company, Nellix, Inc. (“Nellix”), certain of Nellix’s stockholders named therein and Essex Woodlands Health Ventures, Inc., as representative of the former Nellix stockholders. On December 10, 2010 (the “Nellix Closing Date”), the Company completed its acquisition of Nellix. The purchase price consisted of shares of the Company’s common stock issuable as of the Nellix Closing Date. Additional payments, solely in the form of shares of the Company’s common stock will be made upon the achievement of a revenue milestone and a regulatory approval milestone (collectively, the “Nellix Milestones”). Under the Merger Agreement, the ultimate value of the contingently issuable common stock would be determined on the date that each Nellix Milestone is achieved. The number of issuable shares would be established using an applicable per share price, which is subject to a ceiling and/or floor, resulting at the closing of the merger in a potential maximum of approximately 1,020,000 shares issuable upon the achievement of the Nellix Milestones. As of the Closing Date, the fair value of the contingently issuable common stock was estimated to be $28.2 million.

The Merger Agreement provides that, in addition to the shares of common stock of the Company issued to the former Nellix stockholders at the Nellix Closing Date, if the Company receives approval from the FDA to sell one of Nellix’s products in the United States (the “PMA Milestone”), the Company will issue additional shares of its common stock to the former stockholders of Nellix. The dollar value of the shares of the Company’s common stock to be issued upon achievement of the PMA Milestone will be equal to $15.0 million (less the dollar value of certain cash payments and other deductions). The price per share of the shares of the Company’s common stock to be issued upon achievement of the PMA Milestone is subject to a stock price floor of $45.00 per share but not subject to a stock price ceiling.

The value of the contingently issuable common stock is derived using a discounted income approach model, with a range of probabilities and assumptions related to the timing and likelihood of achievement of the PMA Milestone (which include Level 3 inputs and the Company’s stock price (Level 1 input) as of the balance sheet date). These varying probabilities and assumptions and changes in the Company’s stock price have required fair value adjustments of the contingently issuable common stock in periods subsequent to the Nellix Closing Date.

The fair value of the contingently issuable common stock will continue to be evaluated on a quarterly basis until milestone achievement occurs, or until the expiration of the “Earn-Out Period,” as defined within the Nellix Merger Agreement. Adjustments to the fair value of the contingently issuable common stock are recognized within other income (expense), net in the Condensed Consolidated Statements of Operations and Comprehensive Loss. See the “Fair Value Measurements” section of Note 3 for further details. As of June 30, 2019, the fair value of the contingently issuable common stock was presented in non-current liabilities.

At June 30, 2019 the Company’s stock price closed at $7.24 per share. Thus, had the PMA Milestone been achieved on June 30, 2019 the contingently issuable common stock would have comprised approximately 333,149 shares (based on the 30-day average closing stock price ending 5 days prior to the announcement, subjected to the stock price floor of $45.00 per share), representing a value of $2.3 million.