License And Collaborative Arrangements	3 Months Ended
Mar. 31, 2013
License And Collaborative Arrangements [Abstract]
License And Collaborative Arrangements	NOTE 4. LICENSE AND COLLABORATIVE ARRANGEMENTS Janssen Pharmaceutica N.V. In August 2010, the Company entered into a non-exclusive license agreement with Janssen granting Janssen a license to use certain patents related to our Acuform drug delivery technology in developing fixed dose combinations of canagliflozin and extended release metformin. The Company also granted Janssen a right to reference the New Drug Application covering Glumetza in Janssen's regulatory filings covering the products. In August 2010, Janssen paid the Company a $5.0 million upfront license fee. In September 2010, the Company achieved the first development milestone under the agreement related to formulation work, which triggered a $5.0 million milestone payment which the Company received in October 2010. The Company is eligible to receive additional development milestones, as well as royalties on net sales of the products. The Company also entered into a service agreement with Janssen under which it provided formulation work associated with the products. The formulation work under the agreement was completed in March 2011. In February 2013, the Company completed an additional project for Janssen related to this program and recognized $2.2 million in revenue during the first quarter of 2013. Santarus, Inc. In August 2011, the Company entered into a commercialization agreement with Santarus granting Santarus exclusive rights to manufacture and commercialize Glumetza in the United States. The commercialization agreement supersedes the promotion agreement between the parties previously entered into in July 2008. Under the commercialization agreement, the Company transitioned to Santarus responsibility for manufacturing, distribution, pharmacovigilance and regulatory affairs. The Company ceased shipments of Glumetza in August 2011 and Santarus began distributing and recording product sales on shipments of Glumetza in September 2011. Santarus will continue to be responsible at its expense for advertising and promotional marketing activities for Glumetza. Santarus is required to pay the Company royalties on net product sales of Glumetza in the United States of 26.5% in 2011; 29.5% in 2012; 32.0% in 2013 and 2014; and 34.5% in 2015 and beyond prior to generic entry of a Glumetza product. In the event of generic entry of a Glumetza product in the United States, the parties will equally share proceeds based on a gross margin split. Santarus has the exclusive right to commercialize authorized generic versions of the Glumetza products. Santarus will not pay additional sales milestones to the Company as was required under the prior promotion agreement. Royalty revenue from Santarus for the three months ended March 31, 2013 and 2012 were $13.3 million and $9.2 million, respectively. In connection with its assumption of distribution and sales responsibility of Glumetza, Santarus purchased Depomed’s existing inventory of Glumetza and bulk metformin hydrochloride at cost. Depomed is financially responsible for returns of Glumetza distributed by Depomed, up to the amount of the product returns reserve account for Glumetza product returns on the date immediately before Santarus began distributing Glumetza. Depomed is financially responsible for Glumetza rebates and chargebacks up to the amount of its reserve accounts for those items. Santarus is responsible for all other Glumetza returns, rebates and chargebacks. Under the commercialization agreement, Depomed is responsible for managing any patent infringement lawsuits with respect to Glumetza related patents, subject to certain consent rights in favor of Santarus, including with regard to any proposed settlements. Santarus will reimburse Depomed for 70% of its out-of-pocket costs, and Depomed will reimburse Santarus for 30% of its out-of-pocket costs related to such lawsuits. The Company was previously responsible for managing the patent infringement lawsuit against Lupin Limited (Lupin), which was settled in February 2012 and against Sun Pharmaceutical Industries, Inc. (Sun), which was settled in January 2013. Pursuant to the original promotion agreement, Santarus paid the Company a $12.0 million upfront fee in July 2008. The upfront payment received was originally being amortized as revenue ratably until October 2021, which represented the estimated length of time the Company's obligations existed under the promotion agreement related to manufacturing Glumetza and paying Santarus promotion fees on gross margin of Glumetza. The commercialization agreement in August 2011 superseded the promotion agreement and removed our promotion fee obligations and contemplated removal of our manufacturing obligations. The commercialization agreement included obligations with respect to manufacturing and regulatory transition to Santarus and managing the patent infringement lawsuits against Sun and Lupin. At the time of the commercialization agreement, all of these obligations were estimated to be completed in December 2013. During the fourth quarter of 2012, events occurred related to the transfer of manufacturing with one of the contract manufacturers of Glumetza that pushed the estimated completion date of Depomed's manufacturing obligations to February 2016, which is now the estimated date the Company expects its obligations will be completed under the commercialization agreement. The Company recognized approximately $0.4 million and $1.0 million of revenue associated with this upfront license fee for the three months ended March 31, 2013 and 2012 respectively. The remaining deferred revenue balance is $4.1 million at March 31, 2013. Boehringer Ingelheim International GMBH In March 2011, the Company entered into a license and service agreement with Boehringer Ingelheim International GMBH (Boehringer Ingelheim) granting Boehringer Ingelheim a license to use certain patents related to the Company's Acuform drug delivery technology in development of fixed dose combinations of extended release metformin and proprietary Boehringer Ingelheim compounds in development for type 2 diabetes. Under the terms of the agreement, Boehringer Ingelheim was also granted a right of reference to the New Drug Application covering Glumetza and associated data for use in potential regulatory submission processes. In March 2012, the Company achieved the first milestone under the agreement with respect to delivery of experimental batches of prototype formulations that meet required specifications, and received a nonrefundable $2.5 million milestone payment. As the milestone event was substantive in nature, achievement was not reasonably assured at the inception of the agreement and the milestone was related to past performance, the Company recognized the entire amount of this payment as revenue in the first quarter of 2012. The Company is also eligible to receive additional milestone payments based on regulatory filing and approval events, as well as royalties on worldwide net sales of products. Ironwood Pharmaceuticals, Inc. In July 2011, the Company entered into a collaboration and license agreement with Ironwood Pharmaceuticals, Inc. (Ironwood) granting Ironwood a license for worldwide rights to the Company's Acuform drug delivery technology for an undisclosed Ironwood early stage development program. In March 2012, the Company achieved the first milestone under the agreement with respect to delivery of experimental batches of prototype formulations that meet required specifications, and received a nonrefundable $1.0 million milestone payment. As the nonrefundable milestone was substantive in nature, achievement of the milestone was not reasonably assured at the inception of the agreement and the milestone was related to past performance, the Company recognized the $1.0 million as revenue during the first quarter of 2012. Under the terms of the agreement, the Company may receive additional payments pending achievement of certain development and regulatory milestones, as well as royalties on product sales.

NOTE 4. LICENSE AND COLLABORATIVE ARRANGEMENTS

Janssen Pharmaceutica N.V.

In August 2010, the Company entered into a non-exclusive license agreement with Janssen granting Janssen a license to use certain patents related to our Acuform drug delivery technology in developing fixed dose combinations of canagliflozin and extended release metformin. The Company also granted Janssen a right to reference the New Drug Application covering Glumetza in Janssen's regulatory filings covering the products. In August 2010, Janssen paid the Company a $5.0 million upfront license fee. In September 2010, the Company achieved the first development milestone under the agreement related to formulation work, which triggered a $5.0 million milestone payment which the Company received in October 2010. The Company is eligible to receive additional development milestones, as well as royalties on net sales of the products.

The Company also entered into a service agreement with Janssen under which it provided formulation work associated with the products. The formulation work under the agreement was completed in March 2011.

In February 2013, the Company completed an additional project for Janssen related to this program and recognized $2.2 million in revenue during the first quarter of 2013.

Santarus, Inc.

In August 2011, the Company entered into a commercialization agreement with Santarus granting Santarus exclusive rights to manufacture and commercialize Glumetza in the United States. The commercialization agreement supersedes the promotion agreement between the parties previously entered into in July 2008.

Under the commercialization agreement, the Company transitioned to Santarus responsibility for manufacturing, distribution, pharmacovigilance and regulatory affairs. The Company ceased shipments of Glumetza in August 2011 and Santarus began distributing and recording product sales on shipments of Glumetza in September 2011. Santarus will continue to be responsible at its expense for advertising and promotional marketing activities for Glumetza.

Santarus is required to pay the Company royalties on net product sales of Glumetza in the United States of 26.5% in 2011; 29.5% in 2012; 32.0% in 2013 and 2014; and 34.5% in 2015 and beyond prior to generic entry of a Glumetza product. In the event of generic entry of a Glumetza product in the United States, the parties will equally share proceeds based on a gross margin split. Santarus has the exclusive right to commercialize authorized generic versions of the Glumetza products. Santarus will not pay additional sales milestones to the Company as was required under the prior promotion agreement. Royalty revenue from Santarus for the three months ended March 31, 2013 and 2012 were $13.3 million and $9.2 million, respectively.

In connection with its assumption of distribution and sales responsibility of Glumetza, Santarus purchased Depomed’s existing inventory of Glumetza and bulk metformin hydrochloride at cost. Depomed is financially responsible for returns of Glumetza distributed by Depomed, up to the amount of the product returns reserve account for Glumetza product returns on the date immediately before Santarus began distributing Glumetza. Depomed is financially responsible for Glumetza rebates and chargebacks up to the amount of its reserve accounts for those items. Santarus is responsible for all other Glumetza returns, rebates and chargebacks.

Under the commercialization agreement, Depomed is responsible for managing any patent infringement lawsuits with respect to Glumetza related patents, subject to certain consent rights in favor of Santarus, including with regard to any proposed settlements. Santarus will reimburse Depomed for 70% of its out-of-pocket costs, and Depomed will reimburse Santarus for 30% of its out-of-pocket costs related to such lawsuits. The Company was previously responsible for managing the patent infringement lawsuit against Lupin Limited (Lupin), which was settled in February 2012 and against Sun Pharmaceutical Industries, Inc. (Sun), which was settled in January 2013.

Pursuant to the original promotion agreement, Santarus paid the Company a $12.0 million upfront fee in July 2008. The upfront payment received was originally being amortized as revenue ratably until October 2021, which represented the estimated length of time the Company's obligations existed under the promotion agreement related to manufacturing Glumetza and paying Santarus promotion fees on gross margin of Glumetza. The commercialization agreement in August 2011 superseded the promotion agreement and removed our promotion fee obligations and contemplated removal of our manufacturing obligations. The commercialization agreement included obligations with respect to manufacturing and regulatory transition to Santarus and managing the patent infringement lawsuits against Sun and Lupin. At the time of the commercialization agreement, all of these obligations were estimated to be completed in December 2013. During the fourth quarter of 2012, events occurred related to the transfer of manufacturing with one of the contract manufacturers of Glumetza that pushed the estimated completion date of Depomed's manufacturing obligations to February 2016, which is now the estimated date the Company expects its obligations will be completed under the commercialization agreement.

The Company recognized approximately $0.4 million and $1.0 million of revenue associated with this upfront license fee for the three months ended March 31, 2013 and 2012 respectively. The remaining deferred revenue balance is $4.1 million at March 31, 2013.

Boehringer Ingelheim International GMBH

In March 2011, the Company entered into a license and service agreement with Boehringer Ingelheim International GMBH (Boehringer Ingelheim) granting Boehringer Ingelheim a license to use certain patents related to the Company's Acuform drug delivery technology in development of fixed dose combinations of extended release metformin and proprietary Boehringer Ingelheim compounds in development for type 2 diabetes. Under the terms of the agreement, Boehringer Ingelheim was also granted a right of reference to the New Drug Application covering Glumetza and associated data for use in potential regulatory submission processes.

In March 2012, the Company achieved the first milestone under the agreement with respect to delivery of experimental batches of prototype formulations that meet required specifications, and received a nonrefundable $2.5 million milestone payment. As the milestone event was substantive in nature, achievement was not reasonably assured at the inception of the agreement and the milestone was related to past performance, the Company recognized the entire amount of this payment as revenue in the first quarter of 2012. The Company is also eligible to receive additional milestone payments based on regulatory filing and approval events, as well as royalties on worldwide net sales of products.

Ironwood Pharmaceuticals, Inc.

In July 2011, the Company entered into a collaboration and license agreement with Ironwood Pharmaceuticals, Inc. (Ironwood) granting Ironwood a license for worldwide rights to the Company's Acuform drug delivery technology for an undisclosed Ironwood early stage development program. In March 2012, the Company achieved the first milestone under the agreement with respect to delivery of experimental batches of prototype formulations that meet required specifications, and received a nonrefundable $1.0 million milestone payment. As the nonrefundable milestone was substantive in nature, achievement of the milestone was not reasonably assured at the inception of the agreement and the milestone was related to past performance, the Company recognized the $1.0 million as revenue during the first quarter of 2012. Under the terms of the agreement, the Company may receive additional payments pending achievement of certain development and regulatory milestones, as well as royalties on product sales.