Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands							12 Months Ended		37 Months Ended
	Jan. 01, 2022	May 24, 2021	Jan. 01, 2021	May 19, 2020	Jan. 01, 2020	Jan. 01, 2019	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2022	Dec. 31, 2019
Stock-based compensation
Unvested and outstanding restricted stock (in shares)							9,430	8,500
Increase in shares available for issuance, percent			5.00%		5.00%	5.00%
Stock-based compensation							$ 1,675	$ 739
RSUs awarded (in shares)							18,862
Fair value of vested shares withheld for minimum tax withholding							$ 103	$ 17
2018 Stock Plan
Stock-based compensation
Shares reserved for issuance										32,500
Additional shares authorized		300,000		250,000
Options and restricted stock awards issued (in shares)							745,184
Options and restricted stock awards outstanding (in shares)							715,244
Stock options
Stock-based compensation
Unvested and outstanding options (in shares)							722,765	339,108
Expiration period							10 years
Weighted average grant date fair value of options granted (in dollars per share)							$ 8.99	$ 5.31
Weighted average remaining contractual term for options outstanding							8 years 9 months 14 days
Exercise of common stock options (in shares)							0	0
Stock options | Employee and Director
Stock-based compensation
Stock-based compensation expense, net of estimated forfeitures, related to unvested awards not yet recognized							$ 4,036
Weighted average period over which unrecognized compensation expense is expected to be recognized							2 years 11 months 15 days
Stock options | Minimum
Stock-based compensation
Vesting period for options granted							1 year
Stock options | Maximum
Stock-based compensation
Vesting period for options granted							4 years
Stock options | 2006 Plan
Stock-based compensation
Options awarded to date (in shares)							3,662
Unvested and outstanding options (in shares)							364
Stock options | 2014 Plan
Stock-based compensation
Options awarded to date (in shares)							16,896
Unvested and outstanding options (in shares)							16,108
Restricted stock awards | 2014 Plan
Stock-based compensation
Options awarded to date (in shares)							3,619
Restricted Stock Units (RSUs)
Stock-based compensation
Fair value of vested shares withheld for minimum tax withholding							$ 102	$ 17
Subsequent Event
Stock-based compensation
Increase in shares available for issuance, percent	5.00%
Subsequent Event | 2018 Stock Plan
Stock-based compensation
Additional shares authorized									469,998