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Balance Sheet Details

9 Months Ended

Sep. 30, 2019

Note 3. Balance Sheet Details

Short-term investments

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


	At September 30, 2019
	Maturity	Amortized cost		Unrealized		Unrealized		Estimated
	(in years)	or cost		gains		losses		fair value
U.S. government agency bonds	less than 1		500		—		—		500
Bank certificates of deposit	less than 1		10,500		12		—		10,512
Commercial paper	less than 1		9,442		12		—		9,454
Corporate notes	less than 3		66,697		331		(2)		67,026
Asset-backed securities	less than 3		25,777		124		(8)		25,893
Total		$	112,916	$	479	$	(10)	$	113,385

	At December 31, 2018
	Maturity	Amortized cost		Unrealized		Unrealized		Estimated
	(in years)	or cost		gains		losses		fair value
U.S. government bonds	less than 1	$	1,300	$	-	$	(3)	$	1,297
U.S. government agency bonds	less than 1		1,994		-		(12)		1,982
Bank certificates of deposit	less than 2		15,201		2		(3)		15,200
Commercial paper	less than 1		9,597		1		(5)		9,593
Corporate notes	less than 3		60,923		24		(194)		60,753
Asset-backed securities	less than 3		21,918		18		(94)		21,842
Total		$	110,933	$	45	$	(311)	$	110,667

Accounts receivable, net

Accounts receivable consisted of the following (in thousands):


	September 30,		December 31,
	2019		2018
Accounts receivable	$	25,085	$	19,333
Allowance for doubtful accounts		(740)		(660)
	$	24,345	$	18,673

Inventory, net

Inventory consisted of the following (in thousands):

Accrued liabilities

Accrued liabilities consisted of the following (in thousands):