General form of registration statement for all companies including face-amount certificate companies

Net Loss Per Share - Schedule Of Computation Of net Loss Per Share Attributable to Stockholders (Detail)

v3.21.2
Net Loss Per Share - Schedule Of Computation Of net Loss Per Share Attributable to Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net loss $ (27,822) $ (5,028) $ (8,409) $ (3,406)
Weighted average common stock outstanding, basic and diluted 9,886,283 10,033,298 9,997,049 9,798,949
Net loss per common share, basic and diluted $ (2.81) $ (0.50) $ (0.84) $ (0.35)