The following tables set forth our assets and liabilities that were measured at fair value on a recurring basis at December 31, 2018, and at December 31, 2017, by level within the fair value hierarchy (in thousands):



As of December 31, 2018	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2018

Assets
Money market funds⁽¹⁾	$	250	$	—	$	—	$	250
Equity mutual funds⁽²⁾	$	1,673	$	—	$	—	$	1,673
Cross currency swaps⁽³⁾	$	—	$	1,789	$	—	$	1,789
Foreign currency exchange contracts⁽³⁾	$	—	$	8,163	$	—	$	8,163
Liabilities
Foreign currency exchange contracts⁽³⁾	$	—	$	603	$	—	$	603
Deferred compensation⁽⁴⁾	$	1,673	$	—	$	—	$	1,673



As of December 31, 2017	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2017

Assets
Money market funds⁽¹⁾	$	32,962	$	—	$	—	$	32,962
Certificates of deposit⁽¹⁾	$	—	$	1,250	$	—	$	1,250

Marketable securities
Corporate bonds	$	—	$	140,886	$	—	$	140,886
Certificates of deposit	—		58,510		—		58,510
Commercial paper	—		29,171		—		29,171
Asset backed securities	—		22,167		—		22,167
U.S. government bonds	—		15,611		—		15,611
Agency bonds	—		10,947		—		10,947
Treasury bills	—		6,963		—		6,963
Total marketable securities	$	—	$	284,255	$	—	$	284,255

Equity mutual funds⁽²⁾	$	2,162	$	—	$	—	$	2,162
Foreign currency exchange contracts⁽³⁾	$	—	$	477	$	—	$	477
Liabilities
Foreign currency exchange contracts⁽³⁾	$	—	$	6,468	$	—	$	6,468
Deferred compensation⁽⁴⁾	$	2,162	$	—	$	—	$	2,162


(1)	Money market funds and certificates of deposit with an original maturity of less than ninety days are included within cash and cash equivalents. The remaining balance of cash and cash equivalents as of December 31, 2018, and December 31, 2017, consisted of demand deposits. Certificates of deposit with an original maturity of over ninety days are included within marketable securities.


(2)	Equity mutual funds relate to a deferred compensation plan that was assumed as part of a previous business combination. This amount is included within other long-term assets. See number (4) below for a discussion of the related deferred compensation liability.


(3)	Cross currency swaps and foreign currency exchange contracts are included within other current assets; other long-term assets; accrued liabilities; or other long-term liabilities depending on the gain (loss) position and anticipated settlement date.


(4)	A deferred compensation plan assumed as part of a previous business combination is included within accrued liabilities and other long-term liabilities. The fair value of our deferred compensation plan is indexed to the performance of the underlying equity mutual funds discussed in number (2) above.