Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2017

Cash, Cash Equivalents and Investments

Our cash and cash equivalents consist of cash and instruments with original maturities of less than three months. Our investments consist of instruments with original maturities of more than three months. As of December 31, 2017 and 2016, our cash, cash equivalents and investments are classified as follows (in thousands):


	December 31, 2017								December 31, 2016
			Gross		Gross						Gross		Gross
	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
	Cost		Gain		(Loss)		Value		Cost		Gain		(Loss)		Value
Classified as:
Cash	$	43,610	$	—	$	—	$	43,610	$	23,948	$	—	$	—	$	23,948
Cash equivalents:
Certificates of deposit 1		742		—		—		742		12,204		—		—		12,204
Total cash and cash equivalents		44,352		—		—		44,352		36,152		—		—		36,152
Investments (available-for-sale):
Certificates of deposit 2		7,099		—		(24)		7,075		8,999		1		(20)		8,980
Corporate bonds		25,602		—		(69)		25,533		8,479		—		(47)		8,432
Corporate equity securities		—		—		—		—		48		111		—		159
Total investments		32,701		—		(93)		32,608		17,526		112		(67)		17,571
Total cash, cash equivalents and investments	$	77,053	$	—	$	(93)	$	76,960	$	53,678	$	112	$	(67)	$	53,723
Contractual maturities on investments:
Due within 1 year 3	$	20,056					$	20,032	$	11,325					$	11,415
Due after 1 through 5 years 4		12,645						12,576		6,201						6,156
	$	32,701					$	32,608	$	17,526					$	17,571

Certificate of deposit with original maturities of less than three months.

Certificate of deposit with original maturities of more than three months.

Classified as “Short-term investments” in our consolidated balance sheets.

Classified as “Long-term investments” in our consolidated balance sheets.

Fair value and gross unrealized losses related to available-for-sale securities

A portion of our investments would generate a loss if we sold them on December 31, 2017. The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2017 (in thousands):


	In Loss Position				In Loss Position				Total In
	< 12 months				> 12 months				Loss Position
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
As of December 31, 2017	Value		(Losses)		Value		(Losses)		Value		(Losses)
Investments:
Certificates of deposit	$	3,994	$	(16)	$	2,342	$	(8)	$	6,336	$	(24)
Corporate bonds		25,533		(69)		—		—		25,533		(69)
Total in loss position	$	29,527	$	(85)	$	2,342	$	(8)	$	31,869	$	(93)

The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2016 (in thousands):


	In Loss Position				In Loss Position				Total In
	< 12 months				> 12 months				Loss Position
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
As of December 31, 2016	Value		(Loss)		Value		(Loss)		Value		(Loss)
Investments:
Certificates of deposit	$	5,211	$	(20)	$	1,200	$	—	$	6,411	$	(20)
Corporate bonds		5,037		(35)		3,395		(12)		8,432		(47)
Total in loss position	$	10,248	$	(55)	$	4,595	$	(12)	$	14,843	$	(67)

Summary of financial assets and liabilities measured at fair value on a recurring basis


			Quoted Prices in				Significant
			Active Markets of		Significant Other		Unobservable
	Balance as of		Identical Assets		Observable Inputs		Inputs
	December 31, 2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents and investments:
Certificates of deposit	$	7,817	$	—	$	7,817	$	—
Corporate bonds		25,533		—		25,533		—
Total	$	33,350	$	—	$	33,350	$	—

The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis in accordance with ASC 820 as of December 31, 2016 (in thousands):


			Quoted Prices in				Significant
			Active Markets of		Significant Other		Unobservable
	Balance as of		Identical Assets		Observable Inputs		Inputs
	December 31, 2016		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents and investments:
Certificates of deposit	$	21,184	$	—	$	21,184	$	—
Corporate bonds		8,432		—		8,432		—
Corporate equity securities		159		159		—		—
Total	$	29,775	$	159	$	29,616	$	—