Annual report pursuant to Section 13 and 15(d)

Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail)

v2.4.0.8
Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator                      
Net loss $ (6,678) $ (10,054) $ (8,420) $ (6,697) $ (4,103) $ (5,920) $ (4,215) $ (6,860) $ (31,849) $ (21,098) $ (14,673)
Denominator                      
Weighted average number of common shares outstanding                 14,683,389 13,522,723 9,729,340
Basic and diluted net loss per common share $ (0.45) $ (0.68) $ (0.57) $ (0.46) $ (0.28) $ (0.40) $ (0.29) $ (0.67) $ (2.17) $ (1.56) $ (1.51)