A CVR type of deal is ideal for a company like RVX that isn't in the drivers seat. That type of deal allows the purchasing co to put a small(relative) amount up front and pay a fair price only if success is achieved. As a number of posters have rightly pointed out that trial failures is a stigma of this company a CVR would allow everyone the opportunity to walk away with their heads held up no matter what the outcome of the trial(s) may be.

tada