Equity Award Plans - Summary of Stock Options Activity (Details) - 2006 and 2013 Plan [Member] - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Number of Shares
Balance at beginning of period	383,000
Options forfeited and cancelled	(42,000)
Balance at end of period	341,000	383,000
Options exercisable	326,000
Options vested	326,000
Options vested and expected to vest	341,000
Weighted Average Exercise Price Per Share
Balance at beginning of period	$ 23.23
Options forfeited and cancelled	49.24
Balance at end of period	20.05	$ 23.23
Options exercisable	20.78
Options vested	20.78
Options vested and expected to vest	$ 20.05
Weighted Average Remaining Contractual Term (in Years)
Options outstanding	4 years 10 months 24 days	4 years 10 months 6 days
Options exercisable	4 years 9 months 21 days
Options vested	4 years 9 months 21 days
Options vested and expected to vest	4 years 10 months 24 days
Aggregate Intrinsic Value
Options outstanding	$ 0	$ 0
Options exercisable	0
Options vested	0
Options vested and expected to vest	$ 0