Stockholders' Deficit -Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Class Of Stock [Line Items]
Stock-based compensation expense	$ 1,075	$ 205	$ 5,684	$ 754
Cost of Goods Sold
Class Of Stock [Line Items]
Stock-based compensation expense	66	46	236	116
Sales and Marketing
Class Of Stock [Line Items]
Stock-based compensation expense	406	49	1,701	256
Research and Development
Class Of Stock [Line Items]
Stock-based compensation expense	8	1	127	7
General and Administrative
Class Of Stock [Line Items]
Stock-based compensation expense	$ 595	$ 109	$ 3,620	$ 375