Equity Award Plans - Summary of Stock Options Activity (Details) - 2006 and 2013 Plan [Member] - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Number of Shares
Balance at beginning of period	337,000
Options forfeited and cancelled	(8,000)
Balance at end of period	329,000	337,000
Options exercisable	314,000
Options vested	314,000
Options vested and expected to vest	329,000
Weighted Average Exercise Price Per Share
Balance at beginning of period	$ 19.59
Options forfeited and cancelled	84.29
Balance at end of period	18.03	$ 19.59
Options exercisable	18.70
Options vested	18.70
Options vested and expected to vest	$ 18.03
Weighted Average Remaining Contractual Term (in Years)
Options outstanding	4 years 3 months 21 days	4 years 5 months 12 days
Options exercisable	4 years 2 months 19 days
Options vested	4 years 2 months 19 days
Options vested and expected to vest	4 years 3 months 21 days
Aggregate Intrinsic Value
Options outstanding	$ 0	$ 0
Options exercisable	0
Options vested	0
Options vested and expected to vest	$ 0