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Investments and Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Cash, cash equivalents and investments [Abstract]
Cash	$ 43,608	$ 72,602
Cash equivalents [Abstract]
Total cash and cash equivalents	43,608	72,602
Amortized Cost	12,368	5,963
Cash, cash equivalents and investments, amortized costs	55,976	78,565
Gross Unrealized Gain	4	5
Gross Unrealized (Loss)	(11)	(2)
Fair Value	12,361	5,966
Cash, cash equivalents and investments, amortized costs	55,969	78,568
Contractual maturities on investments, amortized cost basis [Abstract]
Due within 1 year	5,678	240
Due after 1 through 5 years	6,690	5,723
Investments, amortized cost	12,368	5,963
Contractual maturities on investments, fair value basis [Abstract]
Due within 1 year	5,681	240
Due after 1 through 5 years	6,680	5,726
Investments, fair value	12,361	5,966
Total Investments
Cash equivalents [Abstract]
Amortized Cost	12,368	5,963
Gross Unrealized Gain	4	5
Gross Unrealized (Loss)	(11)	(2)
Fair Value	12,361	5,966
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	12,368	5,963
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	12,361	5,966
Certificates of deposit.
Cash equivalents [Abstract]
Amortized Cost	4,760	2,880
Gross Unrealized Gain	3	5
Gross Unrealized (Loss)	(1)
Fair Value	4,762	2,885
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	4,760	2,880
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	4,762	2,885
Corporate bonds
Cash equivalents [Abstract]
Amortized Cost	7,608	3,083
Gross Unrealized Gain	1
Gross Unrealized (Loss)	(10)	(2)
Fair Value	7,599	3,081
Contractual maturities on investments, amortized cost basis [Abstract]
Investments, amortized cost	7,608	3,083
Contractual maturities on investments, fair value basis [Abstract]
Investments, fair value	$ 7,599	$ 3,081

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