DECLARE @DocIDs TABLE
     (
        ID BIGINT
     )
     INSERT INTO @DocIDs
     SELECT Item FROM dbo.fn_SplitToBigint(@OrderIDs, ';')


SELECT *
     FROM IROrderDocumentCustomModel as cm
          INNER JOIN @DocIDs as d ON d.ID = cm.IROrderDocumentID
     WHERE cm.IsDeleted = 0

SELECT *
     FROM IROrderDocumentCustomModel as cm
     WHERE cm.IsDeleted = 0
          AND cm.IROrderDocumentID IN (SELECT ID FROM @DocIDs)