Subsequent Event	6 Months Ended
Jun. 30, 2013
Subsequent Event [Abstract]
Subsequent Event	10. Subsequent Event Grifols Collaboration Transaction On May 20, 2013, the Company and Grifols, S.A., (“Grifols”) and certain other investors (the “Investors”) entered into a Stock Purchase Agreement (the “Stock Purchase Agreement”), pursuant to which the Company agreed, subject to the terms and conditions set forth in the Stock Purchase Agreement, to issue and sell a total of 209,774,558 shares of the Company’s common stock (“Common Stock”), to Grifols and an additional 124,193,546 shares of Common Stock to the Investors, for a total sale of 333,968,104 shares of Common Stock (the “Company Stock Sale”), for a purchase price of $0.124 per share. The aggregate gross consideration payable to the Company in the Company Stock Sale is approximately $41.4 million. In conjunction with signing the Stock Purchase Agreement, the Company and Grifols agreed to enter into a License and Collaboration Agreement (the “License Agreement”) at the closing of the Company Stock Sale. The License Agreement would exclusively license the Company’s inhaled liposomal ciprofloxacin compound for the indication of non-cystic fibrosis bronchiectasis and other indications (the “Program”) to Grifols on a worldwide basis. Grifols would fund development expenses and commercialize products from the Program (“Products”), and pay development milestones and royalties on future commercial sales of Products. The License Agreement is described further below. The Company held a special meeting of its shareholders on July 15, 2013 to (i) approve certain amendments to the Company’s charter, including amendments necessary to increase the total number of shares of Common Stock authorized to be issued by the Company to at least 706,830,627 shares, including the 333,968,104 shares to be sold in the Company Stock Sale (the “Charter Amendment”) and (ii) to approve the Company’s closing of the Company Stock Sale and entering into the License Agreement, Governance Agreement and other agreements described below and in the Stock Purchase Agreement (the “Transactions”). Shareholders of the Company holding more than 50% of the outstanding shares of the Company’s Common Stock voted in favor of these proposals at the special meeting. The closing of the Transactions is subject to certain closing conditions, including, among others the Company’s entering into binding terms with a third party to commercially manufacture Products to permit the Company to satisfy its obligation to commercially supply Grifols with Products. The Stock Purchase Agreement contains certain termination rights for both the Company and Grifols, including if the Transactions are not concluded on or before November 20, 2013 *License Agreement* The License Agreement will be signed simultaneously with the closing of the Company Stock Sale. Under the License Agreement, the Company will grant to Grifols an exclusive license to the Program, the lead product candidate under which is named Pulmaquin®. The license permits Grifols to commercialize Products throughout the world and grants Grifols a back-up manufacturing right to produce Products. The Company will develop the Product for non-cystic fibrosis bronchiectasis or pulmonary infections associated with non-cystic fibrosis bronchiectasis, in accordance with an agreed upon development plan and pursuant to a Grifols-funded budget of $65 million (which includes allocations for the Company’s internal, fully-burdened expenses). Any excess expenses will be borne by the Company. The Company will develop the Product for additional indications at Grifols’ sole expense if Grifols elects to pursue such development. The Company will be responsible for obtaining regulatory approval of the first indication for the Product in the United States and the European Union. Additional regulatory expenses will be borne by Grifols, including the cost of obtaining approval outside the United States and European Union, and the cost of maintaining approvals globally. Grifols will use diligent efforts to commercialize the Product in countries where regulatory approval has been obtained. The Company will be responsible for supplying Grifols’ requirements of the Product, and must establish primary and back-up suppliers acceptable to Grifols. Grifols will purchase Products from the Company on a cost pass-through basis plus a margin. The collaboration between Grifols and the Company will be governed by a joint committee comprised of equal representation by the Company and Grifols and operated on a consensus basis. In the event that the parties do not agree, Grifols shall have deciding authority, except with respect to specific matters specified in the License Agreement. Grifols will make development milestone payments of up to $25 million (with an initial payment of $5 million for initiation of the first Phase III clinical trial). On a country-by-country basis, Grifols will make royalty payments on net sales at a rate of either 12.5% or 20% (depending on the amount of net sales) for so long as there is patent coverage or orphan drug designation (or, if longer, 10 years), except that payments will be reduced by half in the event that a competitive product is being sold. The License Agreement includes representations and warranties on behalf of Aradigm as are customarily found in transactions of this nature, including representations and operative provisions as to the licensed intellectual property, regulatory matters and compliance with applicable laws. The License Agreement also provides for certain mutual indemnities for breaches of representations, warranties and covenants. *Option Agreement* Simultaneously with execution of the License Agreement, Aradigm will enter into an Option Agreement (the “Option Agreement”) with Grifols granting Grifols a limited term option to license Aradigm’s AERx® pulmonary drug delivery platform for use with another molecule. The Option Agreement affords Grifols a limited period of time to conduct a diligence assessment. If Grifols elects to proceed with a license, Grifols will pay Aradigm a low single digit royalty on net sales but bear all costs associated with development and commercialization. *Governance Agreement* In connection with and simultaneously with the closing of the Company Stock Sale, the Company and Grifols will enter into a Governance Agreement (the “Governance Agreement”), which sets forth certain rights and obligations of the Company and Grifols concerning, among other things, certain corporate governance matters, certain limitations on future acquisitions of shares of Common Stock by Grifols, and certain rights by Grifols to maintain a target level of ownership in the Company. On the date the Governance Agreement is executed, the Company’s board of directors will be reconstituted to consist of its chief executive officer, three independent directors under the NASDAQ Marketplace Rules and two persons designated by Grifols. The number of persons Grifols is entitled to designate for consideration for election to the Company’s board of directors by the Company’s nominating committee will thereafter depend on the percentage of beneficial ownership of the Company held by Grifols. The Governance Agreement also provides that during the period beginning on the date of Closing and ending 12 months after the first commercial sale of a Product (the “Restricted Period”), Grifols will not directly or indirectly acquire or offer to acquire any shares of Common Stock except (i) with the approval of the Company’s board of directors and a majority of its independent directors, (ii) effected solely to the extent necessary to maintain the beneficial ownership of Grifols and its affiliates at an amount equal to 35% (the “Target Percentage”) of the shares of Common Stock on a Fully Diluted Basis (as defined in the Governance Agreement), or (iii) in order to maintain its ownership percentage in the event that the Company issues new securities, in accordance with the provisions of the Governance Agreement. The Restricted Period terminates upon the occurrence of certain events, including a change in control of the Company and a third party publicly proposing to acquire the Company. The Governance Agreement further imposes certain “standstill” obligations on Grifols during the Restricted Period, pursuant to which Grifols and certain related persons are prohibited from soliciting proxies from the Company’s shareholders, granting proxies or entering into voting agreements and seeking additional representation on the Company’s board of directors. The Governance Agreement provides Grifols with certain preemptive rights to participate in future issuances of Common Stock or equivalents of Common Stock by the Company, or the right to acquire shares of Common Stock from third parties or on the open market to maintain its Fully Diluted Ownership at the Target Percentage. The Governance Agreement requires the approval of Grifols for certain actions by the Company which would adversely affect Grifols’ rights under the Governance Agreement, and for the Company to terminate the employment of its Chief Executive Officer or to appoint any successor Chief Executive Officer. *Registration Rights Agreements* In connection with and concurrently with the closing of the Company Stock Sale, the Company will enter into a Registration Rights Agreement with Grifols (the “Grifols Registration Rights Agreement”), pursuant to which the Company agreed to provide registration rights to Grifols with respect to the shares of Common Stock to be acquired in the Company Stock Sale. Under such agreement, Grifols will be entitled to require the Company to file with the SEC certain registration statements under the Securities Act of 1933, as amended (the “Securities Act”), with respect to the resale of the shares of Common Stock acquired by Grifols in the Company Stock Sale up to three times on Form S-1 and up to six times on Form S-3, and to include its shares of Common Stock in any registration the Company proposes for its own account or for the account of one or more of its shareholders. In connection with and concurrently with the closing of the Company Stock Sale, the Company and the Investors also entered into a Registration Rights Agreement (the “Investors Registration Rights Agreement”). Pursuant to the Investors Registration Rights Agreement, the Company is required to file a registration statement to cover the resale of the shares of the Common Stock acquired by the investors in the Company Stock Sale. The failure on the part of the Company to satisfy the deadlines set forth in the Investors Registration Rights Agreement may subject the Company to payment of certain monetary penalties. In addition, pursuant to the terms of the Stock Purchase Agreement, the Company has agreed, among other things, not to file any other registration statement (other than any registration statement on Form S-4 or Form S-8, and subject to certain other limitations and exclusions) until the Common Stock subject thereto is covered by an effective registration statement or freely salable under Rule 144 under the Securities Act.

Subsequent Event

6 Months Ended

Jun. 30, 2013

10. Subsequent Event

Grifols Collaboration Transaction

On May 20, 2013, the Company and Grifols, S.A., (“Grifols”) and certain other investors (the “Investors”) entered into a Stock Purchase Agreement (the “Stock Purchase Agreement”), pursuant to which the Company agreed, subject to the terms and conditions set forth in the Stock Purchase Agreement, to issue and sell a total of 209,774,558 shares of the Company’s common stock (“Common Stock”), to Grifols and an additional 124,193,546 shares of Common Stock to the Investors, for a total sale of 333,968,104 shares of Common Stock (the “Company Stock Sale”), for a purchase price of $0.124 per share. The aggregate gross consideration payable to the Company in the Company Stock Sale is approximately $41.4 million.

In conjunction with signing the Stock Purchase Agreement, the Company and Grifols agreed to enter into a License and Collaboration Agreement (the “License Agreement”) at the closing of the Company Stock Sale. The License Agreement would exclusively license the Company’s inhaled liposomal ciprofloxacin compound for the indication of non-cystic fibrosis bronchiectasis and other indications (the “Program”) to Grifols on a worldwide basis. Grifols would fund development expenses and commercialize products from the Program (“Products”), and pay development milestones and royalties on future commercial sales of Products. The License Agreement is described further below.

The Company held a special meeting of its shareholders on July 15, 2013 to (i) approve certain amendments to the Company’s charter, including amendments necessary to increase the total number of shares of Common Stock authorized to be issued by the Company to at least 706,830,627 shares, including the 333,968,104 shares to be sold in the Company Stock Sale (the “Charter Amendment”) and (ii) to approve the Company’s closing of the Company Stock Sale and entering into the License Agreement, Governance Agreement and other agreements described below and in the Stock Purchase Agreement (the “Transactions”). Shareholders of the Company holding more than 50% of the outstanding shares of the Company’s Common Stock voted in favor of these proposals at the special meeting.

The closing of the Transactions is subject to certain closing conditions, including, among others the Company’s entering into binding terms with a third party to commercially manufacture Products to permit the Company to satisfy its obligation to commercially supply Grifols with Products.

The Stock Purchase Agreement contains certain termination rights for both the Company and Grifols, including if the Transactions are not concluded on or before November 20, 2013

License Agreement

The License Agreement will be signed simultaneously with the closing of the Company Stock Sale. Under the License Agreement, the Company will grant to Grifols an exclusive license to the Program, the lead product candidate under which is named Pulmaquin®. The license permits Grifols to commercialize Products throughout the world and grants Grifols a back-up manufacturing right to produce Products.

The Company will develop the Product for non-cystic fibrosis bronchiectasis or pulmonary infections associated with non-cystic fibrosis bronchiectasis, in accordance with an agreed upon development plan and pursuant to a Grifols-funded budget of $65 million (which includes allocations for the Company’s internal, fully-burdened expenses). Any excess expenses will be borne by the Company. The Company will develop the Product for additional indications at Grifols’ sole expense if Grifols elects to pursue such development.

The Company will be responsible for obtaining regulatory approval of the first indication for the Product in the United States and the European Union. Additional regulatory expenses will be borne by Grifols, including the cost of obtaining approval outside the United States and European Union, and the cost of maintaining approvals globally. Grifols will use diligent efforts to commercialize the Product in countries where regulatory approval has been obtained.

The Company will be responsible for supplying Grifols’ requirements of the Product, and must establish primary and back-up suppliers acceptable to Grifols. Grifols will purchase Products from the Company on a cost pass-through basis plus a margin.

The collaboration between Grifols and the Company will be governed by a joint committee comprised of equal representation by the Company and Grifols and operated on a consensus basis. In the event that the parties do not agree, Grifols shall have deciding authority, except with respect to specific matters specified in the License Agreement.

Grifols will make development milestone payments of up to $25 million (with an initial payment of $5 million for initiation of the first Phase III clinical trial). On a country-by-country basis, Grifols will make royalty payments on net sales at a rate of either 12.5% or 20% (depending on the amount of net sales) for so long as there is patent coverage or orphan drug designation (or, if longer, 10 years), except that payments will be reduced by half in the event that a competitive product is being sold.

The License Agreement includes representations and warranties on behalf of Aradigm as are customarily found in transactions of this nature, including representations and operative provisions as to the licensed intellectual property, regulatory matters and compliance with applicable laws. The License Agreement also provides for certain mutual indemnities for breaches of representations, warranties and covenants.

Option Agreement

Simultaneously with execution of the License Agreement, Aradigm will enter into an Option Agreement (the “Option Agreement”) with Grifols granting Grifols a limited term option to license Aradigm’s AERx® pulmonary drug delivery platform for use with another molecule. The Option Agreement affords Grifols a limited period of time to conduct a diligence assessment. If Grifols elects to proceed with a license, Grifols will pay Aradigm a low single digit royalty on net sales but bear all costs associated with development and commercialization.

Governance Agreement

In connection with and simultaneously with the closing of the Company Stock Sale, the Company and Grifols will enter into a Governance Agreement (the “Governance Agreement”), which sets forth certain rights and obligations of the Company and Grifols concerning, among other things, certain corporate governance matters, certain limitations on future acquisitions of shares of Common Stock by Grifols, and certain rights by Grifols to maintain a target level of ownership in the Company.

On the date the Governance Agreement is executed, the Company’s board of directors will be reconstituted to consist of its chief executive officer, three independent directors under the NASDAQ Marketplace Rules and two persons designated by Grifols. The number of persons Grifols is entitled to designate for consideration for election to the Company’s board of directors by the Company’s nominating committee will thereafter depend on the percentage of beneficial ownership of the Company held by Grifols.

The Governance Agreement also provides that during the period beginning on the date of Closing and ending 12 months after the first commercial sale of a Product (the “Restricted Period”), Grifols will not directly or indirectly acquire or offer to acquire any shares of Common Stock except (i) with the approval of the Company’s board of directors and a majority of its independent directors, (ii) effected solely to the extent necessary to maintain the beneficial ownership of Grifols and its affiliates at an amount equal to 35% (the “Target Percentage”) of the shares of Common Stock on a Fully Diluted Basis (as defined in the Governance Agreement), or (iii) in order to maintain its ownership percentage in the event that the Company issues new securities, in accordance with the provisions of the Governance Agreement. The Restricted Period terminates upon the occurrence of certain events, including a change in control of the Company and a third party publicly proposing to acquire the Company. The Governance Agreement further imposes certain “standstill” obligations on Grifols during the Restricted Period, pursuant to which Grifols and certain related persons are prohibited from soliciting proxies from the Company’s shareholders, granting proxies or entering into voting agreements and seeking additional representation on the Company’s board of directors.

The Governance Agreement provides Grifols with certain preemptive rights to participate in future issuances of Common Stock or equivalents of Common Stock by the Company, or the right to acquire shares of Common Stock from third parties or on the open market to maintain its Fully Diluted Ownership at the Target Percentage.

The Governance Agreement requires the approval of Grifols for certain actions by the Company which would adversely affect Grifols’ rights under the Governance Agreement, and for the Company to terminate the employment of its Chief Executive Officer or to appoint any successor Chief Executive Officer.

Registration Rights Agreements

In connection with and concurrently with the closing of the Company Stock Sale, the Company will enter into a Registration Rights Agreement with Grifols (the “Grifols Registration Rights Agreement”), pursuant to which the Company agreed to provide registration rights to Grifols with respect to the shares of Common Stock to be acquired in the Company Stock Sale. Under such agreement, Grifols will be entitled to require the Company to file with the SEC certain registration statements under the Securities Act of 1933, as amended (the “Securities Act”), with respect to the resale of the shares of Common Stock acquired by Grifols in the Company Stock Sale up to three times on Form S-1 and up to six times on Form S-3, and to include its shares of Common Stock in any registration the Company proposes for its own account or for the account of one or more of its shareholders.

In connection with and concurrently with the closing of the Company Stock Sale, the Company and the Investors also entered into a Registration Rights Agreement (the “Investors Registration Rights Agreement”). Pursuant to the Investors Registration Rights Agreement, the Company is required to file a registration statement to cover the resale of the shares of the Common Stock acquired by the investors in the Company Stock Sale. The failure on the part of the Company to satisfy the deadlines set forth in the Investors Registration Rights Agreement may subject the Company to payment of certain monetary penalties. In addition, pursuant to the terms of the Stock Purchase Agreement, the Company has agreed, among other things, not to file any other registration statement (other than any registration statement on Form S-4 or Form S-8, and subject to certain other limitations and exclusions) until the Common Stock subject thereto is covered by an effective registration statement or freely salable under Rule 144 under the Securities Act.