They have seemed to be one of the few (small) oncology companies that has had consistent successes and monocolonals seem to (still) be a promising technology
Not all went well, SGN-33 development was discontinued recently and one of the SGN-40 trials was discontinued (phase IIb in DLBCL). One note is that the former two are unconjugated monoclonal antibodies, while SGN-35 is an antibody-drug conjugate.
I'm guessing they want to move to front-line and other indications
Quite so, see this phase I trial - Treatment-naive Hodgkin lymphoma so yes, they want to move to front line:
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