Insmed Inc. priced a $100.1 million public offering Wednesday, more than doubling its cash balance, to support work on Arikayce, which, after yielding mixed data earlier this year, now seems poised to become the first once-daily, inhaled antibiotic for nontuberculous mycobacteria (NTM) and Pseudomonas aeruginosa infections in cystic fibrosis (CF) patients.