Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of estimated fair values of financial instruments outstanding

The estimated fair values of financial instruments outstanding were (in thousands):

	December 31, 2015
	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	5,640	$	—	$	—		$	5,640


Short-term investments:
U.S. government-sponsored enterprise bonds	$	6,243	$	—	$	—		$	6,243
Municipal bonds		200		—		—			200
Corporate notes		8,171		—		(16	)		8,155

Total short-term investments	$	14,614	$	—	$	(16	)	$	14,598

	December 31, 2014
	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Cash and cash equivalents	$	3,110	$	—	$	—		$	3,110


Short-term investments:
U.S. government-sponsored enterprise bonds	$	1,250	$	—	$	—		$	1,250
Municipal bonds		841		—		—			841
Corporate notes		15,921		2		(6	)		15,917
Certificates of deposit		2,430		1		—			2,431

Total short-term investments	$	20,442	$	3	$	(6	)	$	20,439


Long-term investments:
U.S. government-sponsored enterprise bonds	$	1,000	$	—	$	(2	)	$	998
Corporate notes		1,252		—		(5	)		1,247

Total long-term investments	$	2,252	$	—	$	(7	)	$	2,245

Schedule of estimated fair values of available-for-sale securities with unrealized losses

The estimated fair values of available-for-sale securities with unrealized losses were (in thousands):

	December 31, 2015
	Cost		Unrealized Losses			Fair Value
Short-term investments:
Corporate notes	$	8,171	$	(16	)	$	8,155

Total short-term investments	$	8,171	$	(16	)	$	8,155

	December 31, 2014
	Cost		Unrealized Losses			Fair Value
Short-term investments:
Corporate notes	$	13,006	$	(6	)	$	13,000

Total short-term investments	$	13,006	$	(6	)	$	13,000


Long-term investments:
U.S. government-sponsored enterprise bonds	$	1,000	$	(2	)	$	998
Corporate notes		1,252		(5	)		1,247

Total long-term investments	$	2,252	$	(7	)	$	2,245

Schedule of cost and fair value of investments based on maturity groups

Cost and fair value of investments based on two maturity groups were (in thousands):

	December 31, 2015
	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Due within 1 year	$	14,614	$	—	$	(16	)	$	14,598

Total	$	14,614	$	—	$	(16	)	$	14,598

	December 31, 2014
	Cost		Unrealized Gains		Unrealized Losses			Fair Value
Due within 1 year	$	20,442	$	3	$	(6	)	$	20,439
Due in 1-2 years		2,252		—		(7	)		2,245

Total	$	22,694	$	3	$	(13	)	$	22,684

Schedule of fair value hierarchy for financial assets (cash equivalents and investments)

The following table represents the Company's fair value hierarchy for its financial assets (cash equivalents and investments) as of December 31, 2015 and 2014 (in thousands):

	December 31, 2015
	Fair Value		Level 1		Level 2		Level 3
Money market funds	$	2,238	$	2,238	$	—	$	—
U.S. government-sponsored enterprise bonds		7,525		—		7,525		—
Municipal bonds		200		—		200		—
Corporate notes		8,255		—		8,255		—
Certificates of deposit		240		—		240		—

Total assets	$	18,458	$	2,238	$	16,220	$	—

	December 31, 2014
	Fair Value		Level 1		Level 2		Level 3
Money market funds	$	1,837	$	1,837	$	—	$	—
U.S. government-sponsored enterprise bonds		2,248		—		2,248		—
Municipal bonds		1,243		—		1,243		—
Corporate notes		17,164		—		17,164		—
Certificates of deposit		2,676		—		2,676		—

Total assets	$	25,168	$	1,837	$	23,331	$	—