Cash, Cash Equivalents and Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash, cash equivalents and investments [Abstract]
Cash	$ 41,348,000	$ 36,763,000
Cash equivalents [Abstract]
Total cash, restricted cash and cash equivalents	41,348,000	36,763,000	$ 72,602,000	$ 26,892,000
Amortized Cost	11,760,000	15,060,000
Cash, cash equivalents and investments, amortized costs	53,108,000	51,823,000
Gross Unrealized (Loss)	(303,000)	(65,000)
Fair Value	11,457,000	14,995,000
Cash, cash equivalents and investments, amortized costs	52,805,000	51,758,000
Contractual maturities on investments, amortized cost basis [Abstract]
Due within 1 year	9,600,000	5,424,000
Due after 1 through 5 years	2,160,000	9,636,000
Investments, amortized cost	11,760,000	15,060,000
Contractual maturities on investments, fair value basis [Abstract]
Due within 1 year	9,339,000	5,419,000
Due after 1 through 5 years	2,118,000	9,576,000
Investments, fair value	11,457,000	14,995,000
Debt Securities, Available-for-sale, Unrealized Loss	303,000
Investments
Cash equivalents [Abstract]
Amortized Cost	11,760,000	15,060,000
Gross Unrealized (Loss)	(303,000)	(65,000)
Fair Value	11,457,000	14,995,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	11,760,000	15,060,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	11,457,000	14,995,000
Certificates of deposit.
Cash equivalents [Abstract]
Amortized Cost	6,440,000	6,680,000
Gross Unrealized (Loss)	(175,000)	(19,000)
Fair Value	6,265,000	6,661,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	6,440,000	6,680,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	6,265,000	6,661,000
Corporate bonds
Cash equivalents [Abstract]
Amortized Cost	5,320,000	8,380,000
Gross Unrealized (Loss)	(128,000)	(46,000)
Fair Value	5,192,000	8,334,000
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	5,320,000	8,380,000
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	$ 5,192,000	$ 8,334,000