Annual report pursuant to Section 13 and 15(d)

SIGNIFICANT CONCENTRATIONS

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SIGNIFICANT CONCENTRATIONS
12 Months Ended
Dec. 31, 2014
SIGNIFICANT CONCENTRATIONS  
SIGNIFICANT CONCENTRATIONS

3. SIGNIFICANT CONCENTRATIONS

        For the year ended December 31, 2014, AZ accounted for all of our revenues. For the year ended December 31, 2013, AZ and Daiichi accounted for 80% and 20% of our revenues, respectively. For the year ended December 31, 2012, AZ, Daiichi and BerGenBio accounted for 44%, 33% and 22% of our revenues, respectively. At both December 31, 2014 and 2013, we had accounts receivable of $5.8 million from AZ in consideration for AZ's decision to continue its development of R256 in asthma in 2014 and 2013, respectively.