Severance and Retention - Summary of Severance and Retention Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]
Severance and retention expense	$ 1,205	$ 2,503
Cost of Revenues [Member]
Restructuring Cost And Reserve [Line Items]
Severance and retention expense	57	950
General and Administrative [Member]
Restructuring Cost And Reserve [Line Items]
Severance and retention expense	469	469
Sales and Marketing [Member]
Restructuring Cost And Reserve [Line Items]
Severance and retention expense	$ 679	1,076
Research and Development [Member]
Restructuring Cost And Reserve [Line Items]
Severance and retention expense		$ 8