Jrand, correct, Bonjour Tristesse was not a hit at the box-office.
When I was a kid (as those who've read Benjamin Kritzer know), one of my childhood theaters became an "art-house" venue, and that's where I saw all my first art-house films (well, that and the Fine Arts on Wilshire near La Cienega - that one has a different name but is STILL an art-house). At the Lido, I saw Diabolique, The Red Balloon, several Fernandel films (which I enjoyed) and many others. Of course, what was "art-house" here may have been hugely successful in the films' native country, like Cherbourg, and Sundays and Cybele, and That Man From Rio, all of which I loved.