Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail)

v3.19.1
Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net loss $ (8,468) $ (7,483) $ (7,576) $ (4,370) $ (6,849) $ (12,904) $ (3,395) $ (2,832) $ (27,897) $ (25,980) $ (12,086)
Average number of common shares-basic and diluted EPS                 30,683,421 23,153,661 19,600,000
Loss per share-basic and diluted                 $ (0.91) $ (1.12) $ (0.62)
Anti-dilutive stock options and restricted stock units                 4,253,301 5,257,365 1,930,600