NOTE 4. CASH, CASH EQUIVALENTS AND INVESTMENTS

The following tables summarize our cash, cash equivalents and investments as of September 30, 2017 and December 31, 2016 (in thousands):



	As of September 30, 2017
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	22,283	$	—	$	—	$	22,283
Commercial paper		3,648		—		—		3,648
Total cash and cash equivalents		25,931		—		—		25,931
Investments:
Commercial paper		23,881		2		(1)		23,882
Corporate debt securities		9,399		1		(1)		9,399
US government & agency securities		24,756		—		(3)		24,753
Total investments		58,036		3		(5)		58,034
Total cash, cash equivalents and investments	$	83,967	$	3	$	(5)	$	83,965

Long-term restricted cash:
Cash	$	4,500	$	—	$	—	$	4,500


	As of December 31, 2016
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	14,516	$	—	$	—	$	14,516
Commercial paper		2,249		—		—		2,249
Total cash and cash equivalents		16,765		—		—		16,765
Investments:
Commercial paper		23,581		5		(3)		23,583
Corporate debt securities		10,741		1		(3)		10,739
Asset backed securities		312		—		—		312
US government & agency securities		20,574		7		(2)		20,579
Total investments		55,208		13		(8)		55,213
Total cash, cash equivalents and investments	$	71,973	$	13	$	(8)	$	71,978

Long-term restricted cash:
Cash	$	4,500	$	—	$	—	$	4,500

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale investments, excluding money market funds, as of September 30, 2017:



(in thousands)	Fair Value
Due in one year or less	$	61,682
Due after one year through 5 years		—
Total investments in debt securities	$	61,682

Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.