Equity Incentive Plans - Stock Option Activity (Details) - Common stock options - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 29, 2023
Options
Options outstanding at beginning of year (in shares)	7,928	5,183
Options granted (in shares)	35,825	3,749
Options exercised (in shares)		0
Options cancelled/forfeited (in shares)	(710)	(1,004)
Options outstanding at end of year (in shares)	43,043	7,928	5,183
Options exercisable at end of year (in shares)	5,007
Vested and expected to vest at end of year (in shares)	43,043
Weighted Average Exercise Price
Options outstanding at beginning of year (in dollars per share)	$ 3,187.50	$ 5,666.50
Options granted (in dollars per share)	2.64	198.50
Options exercised (in dollars per share)		0
Options cancelled/forfeited (in dollars per share)	2,398.42	4,872.00
Options outstanding at end of year (in dollars per share)	548.70	$ 3,187.50	$ 5,666.50
Options exercisable at end of year (in dollars per share)	$ 4,438.73
Weighted Average Remaining Contractual Life (Years)
Options outstanding	9 years	7 years 8 months 12 days	6 years 1 month 6 days
Options exercisable	5 years 9 months 18 days
Estimated stock price (in dollars per share)				$ 1.95