Cash, Cash Equivalents and Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash, cash equivalents and investments [Abstract]
Cash and restricted cash	$ 50,114,000	$ 41,348,000
Cash equivalents [Abstract]
Total cash, restricted cash and cash equivalents	50,114,000	41,348,000	$ 36,763,000	$ 72,602,000
Amortized Cost	2,160,000	11,760,000
Cash, restricted cash, cash equivalents and investments, amortized costs	52,274,000	53,108,000
Gross Unrealized (Loss)	(20,000)	(303,000)
Fair Value	2,140,000	11,457,000
Cash, restricted cash, cash equivalents and investments, fair value.	52,254,000	52,805,000
Contractual maturities on investments, amortized cost basis [Abstract]
Due within 1 year	2,160,000	9,600,000
Due after 1 through 5 years		2,160,000
Investments, amortized cost	2,160,000	11,760,000
Contractual maturities on investments, fair value basis [Abstract]
Due within 1 year	2,140,000	9,339,000
Due after 1 through 5 years		2,118,000
Investments, fair value	2,140,000	11,457,000
Debt Securities, Available-for-sale, Unrealized Loss	20,000
Impairment charge	1,900,000	0	$ 0
Investments.
Cash equivalents [Abstract]
Amortized Cost	2,160,000	11,760,000
Gross Unrealized (Loss)	(20,000)	(303,000)
Fair Value	2,140,000	11,457,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	2,160,000	11,760,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	2,140,000	11,457,000
Certificates of deposit.
Cash equivalents [Abstract]
Amortized Cost	2,160,000	6,440,000
Gross Unrealized (Loss)	(20,000)	(175,000)
Fair Value	2,140,000	6,265,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	2,160,000	6,440,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	$ 2,140,000	6,265,000
Corporate bonds
Cash equivalents [Abstract]
Amortized Cost		5,320,000
Gross Unrealized (Loss)		(128,000)
Fair Value		5,192,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost		5,320,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value		$ 5,192,000