Equity Award Plans - Summary of RSU Activity (Details) - 2013 Plan [Member] - RSUs [Member]	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Number of Shares
Granted and unvested at beginning of period | shares	1,542,000
RSUs granted | shares	728,000
RSUs vested | shares	(342,000)
RSUs cancelled and withheld to cover taxes | shares	(69,000)
Granted and unvested at end of period | shares	1,859,000
Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at beginning of period | $ / shares	$ 4.60
RSUs granted | $ / shares	1.95
RSUs vested | $ / shares	2.23
RSUs cancelled and withheld to cover taxes | $ / shares	6.56
Granted and unvested at end of period | $ / shares	$ 3.93