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)

v3.20.4
Common Stock - Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator                      
Net loss and comprehensive loss $ (4,724) $ (3,764) $ (2,922) $ (3,320) $ (3,194) $ (3,673) $ (3,624) $ (5,904) $ (14,730) $ (16,395) $ (12,687)
Denominator                      
Weighted average number of common shares outstanding                 2,718,909 412,320 175,511
Basic and diluted net loss per common share $ (1.11) $ (1.14) $ (1.68) $ (2.15) $ (5.91) $ (9.07) $ (10.08) $ (17.57) $ (5.42) $ (39.76) $ (72.29)