NOTE 4. CASH AND CASH EQUIVALENTS AND INVESTMENTS

The following table summarizes our cash, cash equivalents and investments as of December 31, 2017 and December 31, 2016 (in thousands):



	As of December 31, 2017
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	14,858	$	—	$	—	$	14,858
Commercial paper		1,649		—		—		1,649
Total cash and cash equivalents		16,507		—		—		16,507
Investments:
Commercial paper		20,408		—		(14)		20,394
Corporate debt securities		9,043		—		(9)		9,034
Asset backed securities		—		—		—		—
US government & agency securities		16,946		—		(9)		16,937
Total investments		46,397		—		(32)		46,365
Total cash, cash equivalents and investments	$	62,904	$	—	$	(32)	$	62,872

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 December 31, 2017:



(in thousands)	Fair Value
Due in one year or less	$	48,014

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