Equity Incentive and Other Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands					3 Months Ended
		Jun. 30, 2023		Dec. 31, 2022	Jun. 30, 2023		Mar. 31, 2023
2021 Plan
Number of Shares
Outstanding (in shares)					101		101
Forfeited or expired (in shares)					(1)		0
Outstanding (in shares)		100	[1]	101	100	[1]	101
Vested and exercisable (in shares)		33			33
Weighted Average Exercise Price
Outstanding (in usd per share)					$ 1.98		$ 1.98
Forfeited or expired (in usd per share)					1.92		1.60
Outstanding (in usd per share)		$ 1.98	[1]	$ 1.98	1.98	[1]	$ 1.98
Vested and exercisable (in usd per share)		$ 1.98			$ 1.98
Aggregate Intrinsic Value
Outstanding		$ 0	[1]	$ 0	$ 0	[1]
Vested and exercisable		$ 0			$ 0
Weighted Average Remaining Contractual Term (in years)
Outstanding		9 years 1 month 20 days	[1]	9 years 7 months 9 days
Vested and exercisable		9 years 1 month 20 days
2018 Plan
Number of Shares
Outstanding (in shares)					2,985		3,431
Exercised (in shares)							0
Forfeited or expired (in shares)					(513)		(446)
Outstanding (in shares)		2,472	[1]	3,431	2,472	[1]	2,985
Vested and exercisable (in shares)		1,380			1,380
Weighted Average Exercise Price
Outstanding (in usd per share)					$ 1.63		$ 1.60
Exercised (in usd per share)							0.40
Forfeited or expired (in usd per share)					1.27		1.40
Outstanding (in usd per share)		$ 1.71	[1]	$ 1.60	1.71	[1]	$ 1.63
Vested and exercisable (in usd per share)		$ 1.34			$ 1.34
Aggregate Intrinsic Value
Outstanding	[1]	$ 6			$ 6
Vested and exercisable		$ 6			$ 6
Weighted Average Remaining Contractual Term (in years)
Outstanding	[1]	4 years 10 months 17 days
Vested and exercisable		5 years 6 months 29 days

[1] Includes 1,416 and 1,056 awards accounted for as service-based and market-based options, respectively, that are vested, that the Company currently deems probable of vesting, or in the case of market-based options, that the Company is expensing so long as the respective service conditions are met. The market-based options will vest only if the price of the Company's common stock reaches a $1 billion market capitalization target for any 20 days during a 30-day period on or before February 4, 2026.