Investments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Notes To Financial Statements [Abstract]

Short-Term And Long-Term Marketable Securities

As of June 30, 2018 and December 31, 2017, the estimated fair value of our short-term and long-term marketable securities, classified as available for sale, are as follows (in thousands):

Short-term

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	32,656	$	—	$	—		$	32,656
Corporate bonds	84,246		1		(205		)	84,042
U.S. government agency bonds	14,013		—		(41		)	13,972
U.S. government treasury bonds	32,953		3		(19		)	32,937
Certificates of deposit	1,022		—		—			1,022
Total marketable securities, short-term	$	164,890	$	4	$	(265	)	$	164,629

Long-term

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government agency bonds	$	7,006	$	—	$	(74	)	$	6,932
Corporate bonds	1,128		1		—			1,129
Total marketable securities, long-term	$	8,134	$	1	$	(74	)	$	8,061

Short-term

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	58,503	$	—	$	(1	)	$	58,502
Corporate bonds	145,728		3		(174		)	145,557
U.S. government agency bonds	3,013		—		(7		)	3,006
U.S. government treasury bonds	60,650		—		(70		)	60,580
Certificates of deposit	4,386		—		—			4,386
Total marketable securities, short-term	$	272,280	$	3	$	(252	)	$	272,031

Long-term

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. government agency bonds	$	15,023	$	—	$	(68	)	$	14,955
Corporate bonds	25,067		2		(76		)	24,993
Total marketable securities, long-term	$	40,090	$	2	$	(144	)	$	39,948

Investments Classified by Contractual Maturity Date

As the carrying value approximates the fair value for our short-term and long-term marketable securities shown in the tables above, the following table summarizes the fair value of our short-term and long-term marketable securities classified by contractual maturity as of June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018		December 31, 2017
One year or less	$	164,629	$	272,031
Due in greater than one year	8,061		39,948
Total available for sale short-term and long-term marketable securities	$	172,690	$	311,979

Investments in privately held companies

Our investments in privately held companies as of June 30, 2018 and December 31, 2017 are as follows (in thousands):

	June 30, 2018		December 31, 2017
Equity securities under the equity method investment 1	$	49,128	$	54,606
Equity securities without readily determinable fair values 2	$	4,862	$	—

Financial Assets Measured At Fair Value On Recurring Basis

The following tables summarize our financial assets measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 (in thousands):

Description	Balance as of June 30, 2018		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	390,103	$	390,103	$	—	$	—
Short-term investments:
Commercial paper	32,656		—		32,656		—
Corporate bonds	84,042		—		84,042		—
U.S. government agency bonds	13,972		—		13,972		—
U.S. government treasury bonds	32,937		32,937		—		—
Certificates of deposit	1,022		—		1,022		—
Long-term investments:
U.S. government agency bonds	6,932		—		6,932		—
Corporate bonds	1,129		—		1,129		—
Prepaid expenses and other current assets:
Israeli funds	3,099		—		3,099		—
	$	565,892	$	423,040	$	142,852	$	—

Description	Balance as of December 31, 2017		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	253,155	$	253,155	$	—	$	—
Commercial paper	7,246		—		7,246		—
Corporate bonds	2,016		—		2,016		—
Short-term investments:
Commercial paper	58,502		—		58,502		—
Corporate bonds	145,557		—		145,557		—
U.S. government agency bonds	3,006		—		3,006		—
U.S. government treasury bonds	60,580		60,580		—		—
Certificates of deposit	4,386		—		4,386		—
Long-term investments:
U.S. government agency bonds	14,955		—		14,955		—
Corporate bonds	24,993		—		24,993		—
Prepaid expenses and other current assets:
Israeli funds	3,075		—		3,075		—
Short-term notes receivable	4,476		—		—		4,476
	$	581,947	$	313,735	$	263,736	$	4,476

Notional value of derivative instruments

The following table presents the gross notional value of all our foreign exchange forward contracts outstanding as of June 30, 2018 (in thousands):

	June 30, 2018
	Local Currency Amount	Notional Contract Amount (USD)
Euro	€64,400	$	75,322
Chinese Yuan	¥150,000	22,574
Canadian Dollar	C$28,000	21,277
British Pound	£13,000	17,159
Japanese Yen	¥1,513,000	13,670
Brazilian Real	R$37,300	9,582
Australian Dollar	A$7,300	5,390
		$	164,974