NOTE 4. CASH, CASH EQUIVALENTS AND INVESTMENTS

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



	As of June 30, 2017
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	Cost		gains		losses		Value
Cash and cash equivalents:
Cash and money market funds	$	17,160	$	—	$	—	$	17,160
Commercial paper		19,319		—		(1)		19,318
Total cash and cash equivalents		36,479		—		(1)		36,478
Investments:
Commercial paper		29,640		2		(2)		29,640
Corporate debt securities		9,718		—		(3)		9,715
Asset backed securities		—		—		—		—
US government & agency securities		26,775		—		(12)		26,763
Total investments		66,133		2		(17)		66,118
Total cash, cash equivalents and investments	$	102,612	$	2	$	(18)	$	102,596

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 June 30, 2017:



(in thousands)	Fair Value
Due in one year or less	$	84,143
Due after one year through 5 years		1,293
Total investments in debt securities	$	85,436

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