Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cash, cash equivalents and investments

As of December 31, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash	$	10,918	$	—	$	—		$	10,918
Money market funds		1,258		—		—			1,258
Certificates of deposit		492		—		—			492
Commercial paper		3,274		—		(1	)		3,273
Corporate notes and bonds		9,423		4		—			9,427
U.S. government treasury		4,599		—		—			4,599
	$	29,964	$	4	$	(1	)	$	29,967
Classified as:
Cash and cash equivalents	$	13,526	$	—	$	—		$	13,526
Short-term investments		16,438		4		(1	)		16,441
	$	29,964	$	4	$	(1	)	$	29,967

As of December 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash	$	7,814	$	—	$	—		$	7,814
Money market funds		1,137		—		—			1,137
Certificates of deposit		475		—		—			475
Commercial paper		6,912		—		(1	)		6,911
Corporate notes and bonds		7,922		15		(4	)		7,933
U.S. government agency securities		2,145		—		(1	)		2,144
	$	26,405	$	15	$	(6	)	$	26,414
Classified as:
Cash and cash equivalents	$	10,087	$	—	$	—		$	10,087
Short-term investments		16,318		15		(6	)		16,327
	$	26,405	$	15	$	(6	)	$	26,414

Fair value of marketable securities classified by the stated maturity date

	December 31,
	2020		2019
Due within one year	$	13,248	$	12,754
Due within two years		3,193		3,573
	$	16,441	$	16,327

Unrealized losses for security investments

As of December 31, 2020	In Gain Position Less Than 12 Months				In Loss Position More Than 12 Months					Total in Gain Position
Description	Fair Value		Unrealized Gain		Fair Value		Unrealized Loss			Fair Value		Unrealized Gain
Certificates of deposit	$	492	$	—	$	—	$	—		$	492	$	—
Corporate notes and bonds		9,502		5		3,195		(2	)		12,697		3
U.S. government agency securities		4,599		—		—		—			4,599		—
Total	$	14,593	$	6	$	3,195	$	(2	)	$	17,788	$	3

As of December 31, 2019	In Gain Position Less Than 12 Months					In Loss Position More Than 12 Months					Total in Gain Position
Description	Fair Value		Unrealized Gain			Fair Value		Unrealized Loss			Fair Value		Unrealized Gain
Certificates of deposit	$	475	$	—		$	—	$	—		$	475	$	—
Corporate notes and bonds		10,120		15			4,714		(5	)		14,834		10
U.S. government agency securities		2,145		(1	)		—		—			2,145		(1	)
Total	$	12,740	$	14		$	4,714	$	(5	)	$	17,454	$	9

Allowance for doubtful accounts

	Amount
Balance, December 31, 2018	$	13
Provision for doubtful accounts		40
Accounts written off		(25	)
Balance, December 31, 2019		28
Provision for doubtful accounts		37
Accounts written off		(61	)
Balance, December 31, 2020	$	4

Deferred revenue activity

	Amount
Balance, December 31, 2018	$	1,135
Deferred revenue		1,887
Recognition of unearned revenue		(1,829	)
Balance, December 31, 2019		1,193
Deferred revenue		1,243
Recognition of unearned revenue		(1,555	)
Balance, December 31, 2020	$	881

Computation of basic and diluted earnings per share

	Years Ended December 31,
	2020		2019
Net income	$	446	$	3,846
Basic:
Weighted-average common shares outstanding		19,192		18,977
Basic earnings per share	$	0.02	$	0.20
Diluted
Weighted-average common shares outstanding		19,192		18,977
Effect of dilutive securities:
Stock options and restricted stock units		177		49
Diluted weighted-average commons shares outstanding		19,369		19,026
Diluted earnings per share	$	0.02	$	0.20

Fair value hierarchy for our financial assets measured at fair value on a recurring basis

As of December 31, 2020	Level 1		Level 2		Level 3		Total
Money market funds	$	1,258	$	—	$	—	$	1,258
Certificates of deposit		—		492		—		492
Commercial paper		—		3,273		—		3,273
Corporate notes and bonds		—		9,427		—		9,427
U.S. government agency securities		—		4,599		—		4,599
Total	$	1,258	$	17,791	$	—	$	19,049

As of December 31, 2019	Level 1		Level 2		Level 3		Total
Money market funds	$	1,137	$	—	$	—	$	1,137
Certificates of deposit		—		475		—		475
Commercial paper		—		6,911		—		6,911
Corporate notes and bonds		—		7,933		—		7,933
U.S. government agency securities		—		2,144		—		2,144
Total	$	1,137	$	17,463	$	—	$	18,600

Long-lived assets by geographic location

	December 31,
	2020		2019
United States	$	1,110	$	532
Philippines		4		1
India		1		—
Total	$	1,115	$	533