The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss and fair value of the Company’s cash equivalents and short-term investments as of the dates indicated (in thousands):

	June 30, 2019
	Cost or Amortized		Unrealized					Estimated Fair
	Cost		Gains		Losses			Value
Unrestricted Balances⁽¹⁾
Money market funds	$	67,232	$	—	$	—		$	67,232
Term deposit		105,000		—		—			105,000
Certificates of deposit		1,486,173		2,284		(1	)		1,488,456
Commercial paper		1,025,517		332		(84	)		1,025,765
Corporate bonds		284,195		482		—			284,677
Total unrestricted cash equivalents and short-term investments		2,968,117		3,098		(85	)		2,971,130
Restricted Balances⁽²⁾⁽³⁾
Money market funds		1,438		—		—			1,438
Certificates of deposit		433,859		608		(4	)		434,463
Commercial paper		734,240		211		(71	)		734,380
Corporate bonds		62,450		82		(1	)		62,531
Total restricted cash equivalents and investments		1,231,987		901		(76	)		1,232,812
Total unrestricted and restricted cash equivalents and investments	$	4,200,104	$	3,999	$	(161	)	$	4,203,942

(1)	Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of June 30, 2019 in addition to $339.2 million of cash.

(2)	Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of June 30, 2019 in addition to $57.6 million of restricted cash.

(3)	Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of June 30, 2019 is $2.1 million of restricted cash.

	December 31, 2018
	Cost or Amortized		Unrealized					Estimated Fair
	Cost		Gains		Losses			Value
Unrestricted Balances⁽¹⁾
Money market funds	$	38,528	$	—	$	—		$	38,528
Certificates of deposit		497,748		19		(213	)		497,554
Commercial paper		1,135,092		38		(409	)		1,134,721
Corporate bonds		119,043		19		(23	)		119,039
Total unrestricted cash equivalents and short-term investments		1,790,411		76		(645	)		1,789,842
Restricted Balances⁽²⁾⁽³⁾
Money market funds		4,620		—		—			4,620
Certificates of deposit		307,650		41		(87	)		307,604
Commercial paper		624,719		17		(227	)		624,509
Corporate bonds		65,616		6		(36	)		65,586
Total restricted cash equivalents and investments		1,002,605		64		(350	)		1,002,319
Total unrestricted and restricted cash equivalents and investments	$	2,793,016	$	140	$	(995	)	$	2,792,161

(1)	Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $248.0 million of cash.

(2)	Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $50.2 million of restricted cash.

(3)	Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of December 31, 2018 is $1.4 million of restricted cash.

The Company’s short-term investments consist of available-for-sale securities and a term deposit. Available-for-sale investments are reported at fair value, with unrealized gains and losses, included as a separate component of stockholders’ equity (deficit) within accumulated other comprehensive income. The term deposit is reported at cost, which approximates fair value.

The weighted-average remaining maturity of the Company’s investment portfolio was less than one year as of the periods presented. No individual security incurred continuous unrealized losses for greater than 12 months.

The following table provides a rollforward of the insurance reserve for the periods presented (in thousands):