X0306 4 2016-11-21 false 0001333170 NxStage Medical, Inc. NXTM 0001341402 Giannini Daniel A 350 MERRIMACK STREET LAWRENCE MA 01843 true false false false Common Stock 2016-11-21 4 S false 6449 25.96 D 63193 D This represents the weighted average price for shares sold in multiple transactions at prices ranging from $25.82 to $26.12, inclusive. Full information regarding the number of shares sold at each separate price within the range will be provided to NxStage Medical, Inc., any security holder of NxStage Medical, Inc. or the staff of the Securities and Exchange Commission, upon request. Aras Lapinskas, attorney-in-fact for Daniel Giannini 2016-11-22