Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2023

Balance Sheet Components [Abstract]

Fair Value of the Available-For-Sale Investments

	March 31, 2023
			Gross Unrealized				Estimated
	Amortized Cost		Gains		Losses		Fair Value
Money market funds	$	50,714	$	—	$	—	$	50,714
U.S. treasury bills		9,969		—		—		9,969
Commercial paper		37,613		—		—		37,613
U.S. government securities		75,128		7		(58)		75,077
Corporate bonds/notes		1,512		—		(11)		1,501
Agency bonds/notes		29,621		144		—		29,765
	$	204,557	$	151	$	(69)	$	204,639
Classified as:
Cash equivalents							$	50,714
Short-term investments								138,640
Long-term investments								15,285
							$	204,639

	December 31, 2022
			Gross Unrealized				Estimated
	Amortized Cost		Gains		Losses		Fair Value
Money market funds	$	55,158	$	—	$	—	$	55,158
U.S. treasury bills		19,772		4		—		19,776
Commercial paper		48,875		—		—		48,875
Corporate bonds/notes		1,528		—		(13)		1,515
U.S. government securities		83,432		2		(164)		83,270
Asset-backed securities		2,000		—		(4)		1,996
Agency notes		2,876		8		—		2,884
	$	213,641	$	14	$	(181)	$	213,474
Classified as:
Cash equivalents							$	55,158
Short-term investments								158,316
							$	213,474

Fair Value of Cash Equivalents, Short-Term and Long-Term Equivalents

	March 31,		December 31,
	2023		2022
Amounts maturing within one year	$	189,354	$	213,474
Amounts maturing after one year through two years		15,285		—
	$	204,639	$	213,474

Available-For-Sale Investments in Unrealized Loss Position

	March 31, 2023				December 31, 2022
	Less than 12 months				Less than 12 months
Assets:	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government securities		45,486		(58)		73,329		(164)
Corporate bonds/notes		1,490		(11)		1,490		(13)
Asset-backed securities		—		—		1,994		(4)
	$	46,976	$	(69)	$	76,813	$	(181)

Schedule of Inventories

	March 31,		December 31,
	2023		2022
Raw materials	$	5,316	$	4,913
Finished products		11,866		14,380
	$	17,182	$	19,293

Schedule of Accrued Liabilities

	March 31,		December 31,
	2023		2022
Accrued payroll and related expenses	$	8,711	$	15,216
Operating lease liability		1,874		1,844
Accrued royalty expense		951		973
Accrued professional services		718		781
Accrued travel expenses		728		775
Provision for sales returns		618		540
Accrued interest payable		519		519
Deferred revenue		209		253
Accrued clinical expenses		334		249
Accrued other expenses		936		815
Total	$	15,598	$	21,965