Cash, Cash Equivalents and Investments - Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 65,643	$ 112,514
Unrealized Holding Gains	0	0
Unrealized Holding Losses	161	484
Fair Value	65,482	112,030
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,826	68,910
Unrealized Holding Gains	0	0
Unrealized Holding Losses	4	6
Fair Value	43,822	68,904
Cash and Cash Equivalents | Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,236	26,465
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Fair Value	14,236	26,465
Cash and Cash Equivalents | Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,154	9,589
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Fair Value	15,154	9,589
Cash and Cash Equivalents | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,436	32,856
Unrealized Holding Gains	0	0
Unrealized Holding Losses	4	6
Fair Value	14,432	32,850
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,937	25,772
Unrealized Holding Gains	0	0
Unrealized Holding Losses	132	231
Fair Value	17,805	25,541
Short-term Investments | Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,012
Unrealized Holding Gains		0
Unrealized Holding Losses		13
Fair Value		1,999
Short-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,873	4,210
Unrealized Holding Gains	0	0
Unrealized Holding Losses	78	32
Fair Value	5,795	4,178
Short-term Investments | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,222	1,486
Unrealized Holding Gains	0	0
Unrealized Holding Losses	4	25
Fair Value	1,218	1,461
Short-term Investments | U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,997	4,771
Unrealized Holding Gains	0	0
Unrealized Holding Losses	49	123
Fair Value	7,948	4,648
Short-term Investments | Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,400	3,850
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	10
Fair Value	1,400	3,840
Short-term Investments | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,445	9,443
Unrealized Holding Gains	0	0
Unrealized Holding Losses	1	28
Fair Value	1,444	9,415
Long-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,880	17,832
Unrealized Holding Gains	0	0
Unrealized Holding Losses	25	247
Fair Value	3,855	17,585
Long-term Investments | Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,650	6,749
Unrealized Holding Gains	0	0
Unrealized Holding Losses	13	85
Fair Value	1,637	6,664
Long-term Investments | Corporate bonds and medium-term notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,230	5,366
Unrealized Holding Gains	0	0
Unrealized Holding Losses	12	102
Fair Value	$ 2,218	5,264
Long-term Investments | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		224
Unrealized Holding Gains		0
Unrealized Holding Losses		6
Fair Value		218
Long-term Investments | U.S. treasury and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		5,493
Unrealized Holding Gains		0
Unrealized Holding Losses		54
Fair Value		$ 5,439