Note 12 - Kissei Agreement	6 Months Ended
Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Collaborative Arrangement Disclosure [Text Block]	12. Kissei Agreement In April 2010, the Company entered into an exclusive license agreement for the development and commercialization of PRX302 (and other products covered by the licensed patent). The agreement with Kissei Pharmaceuticals Co., Ltd., a Japanese pharmaceutical company, or Kissei covers the development and commercialization of PRX302 in Japan for the treatment of the symptoms of BPH, prostate cancer, prostatitis or other diseases of the prostate. Pursuant to the agreement in 2010, the Company received an upfront license payment of $3.0 million. The Company has determined that the deliverables under this agreement included the license, the transfer of relevant technical information and participation in a periodic development meeting. The Company recognized the entire upfront license payment upon receipt as the license was deemed to have stand-alone value and no significant undelivered performance obligations were identified in connection with the license. During the six months ended June 30, 2013, the Company recorded as revenue a $5.0 million non-refundable substantive milestone payment due from Kissei upon the achievement of certain development activities during this period. In accordance with the Company’s revenue recognition policy, the Company recognizes the receipt of milestone payments in accordance with the milestone method in the period in which the underlying triggering event occurs.

Note 12 - Kissei Agreement

6 Months Ended

Jun. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Collaborative Arrangement Disclosure [Text Block]

12. Kissei Agreement

In April 2010, the Company entered into an exclusive license agreement for the development and commercialization of PRX302 (and other products covered by the licensed patent). The agreement with Kissei Pharmaceuticals Co., Ltd., a Japanese pharmaceutical company, or Kissei covers the development and commercialization of PRX302 in Japan for the treatment of the symptoms of BPH, prostate cancer, prostatitis or other diseases of the prostate. Pursuant to the agreement in 2010, the Company received an upfront license payment of $3.0 million. The Company has determined that the deliverables under this agreement included the license, the transfer of relevant technical information and participation in a periodic development meeting. The Company recognized the entire upfront license payment upon receipt as the license was deemed to have stand-alone value and no significant undelivered performance obligations were identified in connection with the license.

During the six months ended June 30, 2013, the Company recorded as revenue a $5.0 million non-refundable substantive milestone payment due from Kissei upon the achievement of certain development activities during this period. In accordance with the Company’s revenue recognition policy, the Company recognizes the receipt of milestone payments in accordance with the milestone method in the period in which the underlying triggering event occurs.