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Balance Sheet Details

12 Months Ended

Dec. 31, 2021

Note 3. Balance Sheet Details

Short-term Investments

Short-term investments consisted of the following (in thousands):


		At December 31, 2021
	Maturity	Amortized cost		Unrealized		Unrealized		Estimated
	(in years)	or cost		gains		losses		fair value
U.S. government agency bonds	less than 3	$	123,803	$	8	$	(540)	$	123,271
U.S. government bonds	less than 2		76,765		—		(240)		76,525
Bank certificates of deposit	less than 1		12,500		1		(9)		12,492
Commercial paper	less than 1		2,998		—		(1)		2,997
Corporate notes	less than 3		55,178		37		(183)		55,032
Asset-backed securities	less than 2		23,761		44		(31)		23,774
Municipal bonds	less than 3		19,350		—		(98)		19,252
Total		$	314,355	$	90	$	(1,102)	$	313,343


		At December 31, 2020
	Maturity	Amortized cost		Unrealized		Unrealized		Estimated
	(in years)	or cost		gains		losses		fair value
U.S. government agency bonds	less than 3	$	206,704	$	223	$	(3)	$	206,924
Bank certificates of deposit	less than 1		20,700		8		—		20,708
Commercial paper	less than 1		1,500		—		—		1,500
Corporate notes	less than 3		54,866		308		(1)		55,173
Asset-backed securities	less than 2		13,290		205		—		13,495
Municipal bonds	less than 3		9,954		21		(3)		9,972
Total		$	307,014	$	765	$	(7)	$	307,772

Accounts Receivable, Net

Accounts receivable consisted of the following (in thousands):


	December 31,
	2021		2020

Accounts receivable	$	34,805	$	37,729
Allowance for credit losses		(1,367)		(1,670)
	$	33,438	$	36,059

Inventory

Inventory consisted of the following (in thousands):


	December 31,
	2021		2020

Finished goods	$	6,495	$	5,346
Work in process		7,010		3,584
Raw material		9,506		6,879
	$	23,011	$	15,809

Property and Equipment, Net

Property and equipment consisted of the following (in thousands):


	December 31,
	2021		2020

Buildings	$	874	$	874
Equipment		19,280		15,737
Furniture and fixtures		1,706		1,820
Leasehold improvements		6,152		5,851
Computer equipment and software		3,333		2,754
Land		7,068		7,068
Construction in progress		51,208		5,825
		89,621		39,929
Less accumulated depreciation and amortization		(20,652)		(15,921)
	$	68,969	$	24,008

Depreciation and amortization expense related to property and equipment was $4.8 million, $6.1 million and $3.7 million for the years ended December 31, 2021, December 31, 2020 and December 31, 2019, respectively.

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):


	December 31,
	2021		2020

Accrued bonuses	$	17,015	$	10,815
Accrued vacation benefits		4,196		3,728
Other accrued liabilities		34,816		30,788
	$	56,027	$	45,331