if you transfer funds to idax then there is no big deal. you can login to idax by using your erc20 private key which you use for your MEW. IDAX is a decentralized exchange. After login you can then deposit back your money to you MEW wallet again.
I think IDAX is a scam, if i dont get the funds, ill be making a huge post about it and get it spread around the internet pretty quick i have thousands of people on a stream