Cash, Cash Equivalents and Investments - Recurring Basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	$ 11,457,000	$ 14,995,000
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Transfer from Level 1 to Level 2 , assets	0	0
Transfer from Level 2 to Level 1 , assets	0	0
Transfers into Level 3, assets	0	0
Transfer out of Level 3, assets	0	0
Recurring
Assets, Fair Value Disclosure [Abstract]
Total	11,457,000	14,995,000
Recurring | Certificates of deposit.
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	6,265,000	6,661,000
Recurring | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	5,192,000	8,334,000
Recurring | Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Total	11,457,000	14,995,000
Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit.
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	6,265,000	6,661,000
Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	$ 5,192,000	$ 8,334,000