Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring

The following are the major categories of assets measured at fair value on a recurring basis as of the dates indicated (in thousands):

	As of December 31, 2019
	Level 1		Level 2		Level 3		Total
Asset
Cash equivalents:
Commercial paper	$	—	$	5,794	$	—	$	5,794
Certificate of deposit	—		2,959		—		2,959
Money market funds	228,859		—		—		228,859
	228,859		8,753		—		237,612
Short-term investments:
Commercial paper	—		29,320		—		29,320
Certificate of deposit	—		26,132		—		26,132
Corporate bonds	—		114,202		—		114,202
U.S. Government and agency securities	204,305		—		—		204,305
	204,305		169,654		—		373,959
Funds receivable and seller accounts:
Money market funds	18,168		—		—		18,168
	18,168		—		—		18,168
Long-term investments:
Certificate of deposit	—		4,729		—		4,729
Corporate bonds	—		38,563		—		38,563
U.S. Government and agency securities	46,051		—		—		46,051
	46,051		43,292		—		89,343
	$	497,383	$	221,699	$	—	$	719,082

	As of December 31, 2018
	Level 1		Level 2		Level 3		Total
Asset
Cash equivalents:
Commercial paper	$	—	$	7,775	$	—	$	7,775
Money market funds	244,856		—		—		244,856
	244,856		7,775		—		252,631
Short-term investments:
Commercial paper	—		147,860		—		147,860
Corporate bonds	—		46,801		—		46,801
U.S. Government and agency securities	62,641		—		—		62,641
	62,641		194,661		—		257,302
Funds receivable and seller accounts:
Money market funds	9,229		—		—		9,229
	9,229		—		—		9,229
	$	316,726	$	202,436	$	—	$	519,162