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Cash and Cash Equivalents, and Investments (Tables)

9 Months Ended

Sep. 30, 2020

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents and Investments

The following tables show our cash and cash equivalents, and investments’ adjusted cost, unrealized gain, unrealized loss, and fair value as of September 30, 2020 and December 31, 2019 (in thousands):

			September 30, 2020
			Adjusted Cost						Unrealized Gain						Unrealized Loss						Fair Value
Cash and cash equivalents:
Cash			$	17,346					$	—					$	—					$	17,346
U.S. treasury securities			307,673						—						—						307,673
Money market funds			202,522						—						—						202,522
Total cash and cash equivalents			$	527,541					$	—					$	—					$	527,541
Short-term investments:
Commercial paper			$	204,044					$	38					$	(24)					$	204,058
Corporate securities			516,682						2,644						(57)						519,269
Total short-term investments			$	720,726					$	2,682					$	(81)					$	723,327
Long-term investments:
Corporate securities			$	456,774					$	602					$	(635)					$	456,741
Agency bonds			64,495						25						—						64,520
Total long-term investments			$	521,269					$	627					$	(635)					$	521,261

			December 31, 2019
			Adjusted Cost						Unrealized Gain						Unrealized Loss						Fair Value
Cash and cash equivalents:
Cash			$	241,355					$	—					$	—					$	241,355
Money market funds			146,165						—						—						146,165
Total cash and cash equivalents			$	387,520					$	—					$	—					$	387,520
Short-term investments:
Commercial paper			$	7,489					$	—					$	—					$	7,489
Corporate securities			318,946						425						(78)						319,293
U.S. treasury securities			44,251						39						(4)						44,286
Agency bonds			10,000						6						—						10,006
Total short-term investments			$	380,686					$	470					$	(82)					$	381,074
Long-term investments:
Corporate securities			$	295,103					$	533					$	(158)					$	295,478
Agency bonds			14,999						6						—						15,005
Total long-term investments			$	310,102					$	539					$	(158)					$	310,483

Schedule of Available-for-sale Securities Reconciliation

The following table shows our cash equivalents and investments' adjusted cost and fair value by contractual maturity as of September 30, 2020 (in thousands):

			Adjusted Cost						Fair Value
Due in 1 year or less			$	1,028,399					$	1,031,000
Due in 1-2 years			521,269						521,261
Investments not due at a single maturity date			202,522						202,522
Total			$	1,752,190					$	1,754,783

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