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Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Organization and Basis of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION The Company is focused on enhancing the way patients with cardiorenal and gastrointestinal, or GI, diseases are treated by using the gut as the gateway to delivering medicines that matter. The Company has pioneered the development of small molecule therapeutics that act predominantly in the GI tract, thereby avoiding potentially negative side effects on the rest of the body. The Company’s strategy is to evolve from R&D-focused to an integrated biotech company, by building cardiorenal and GI businesses in the United States, while exploring a variety of strategic commercial options outside the United States. The Company is developing several products and programs focused on underserved medical needs including the following: Cardiorenal Portfolio • Tenapanor: Phase 3 clinical development for treatment of ESRD patients on dialysis suffering from elevated phosphate, or hyperphosphatemia • RDX7675: Phase 3 clinical development for the treatment of patients with hyperkalemia, common in patients with CKD and/or heart failure • Research Programs: the Company is evaluating small-molecule approaches to treat hyperkalemia in order to significantly reduce pill burden as well as leveraging its knowledge of phosphorus absorption to discover improved approaches. Gastrointestinal Portfolio • Tenapanor: Phase 3 clinical development for treatment of IBS-C patients • RDX8940: IND filed in late 2016 to begin clinical studies. • Research Programs: The Company is leveraging our knowledge of the mechanisms of tenapanor in order to discover new agents that modulate transport of ions and other processes in the gut. The Company operates in only one business segment, which is the development of biopharmaceutical products.

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The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.

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