Cash and Cash Equivalents, and Investments (Tables)

12 Months Ended

Dec. 31, 2018

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents, and Investments

The following table shows our cash and cash equivalents, and investments’ adjusted cost, net unrealized loss and fair value as of December 31, 2018 and 2017 (in thousands):

	December 31, 2018							December 31, 2017
	Cost		Net Unrealized Loss			Fair Value		Cost		Net Unrealized Loss			Fair Value
Cash and cash equivalents:
Cash	$	351,345	$	—		$	351,345	$	98,370	$	—		$	98,370
Money market funds	5,052		—			5,052		5,358		—			5,358
Commercial paper	18,267		—			18,267		22,729		—			22,729
Total cash and cash equivalents	$	374,664	$	—		$	374,664	$	126,457	$	—		$	126,457
Short-term investments:
Commercial paper	$	40,500	$	(12	)	$	40,488	$	38,850	$	(27	)	$	38,823
Corporate securities	38,616		(87		)	38,529		23,001		(43		)	22,958
U.S. treasury securities	14,333		(5		)	14,328		19,978		(17		)	19,961
Total short-term investments	$	93,449	$	(104	)	$	93,345	$	81,829	$	(87	)	$	81,742
Long-term investments
Corporate securities	$	14,429	$	(5	)	$	14,424	$	20,405	$	(100	)	$	20,305
U.S. treasury securities	1,630		(2		)	1,628		—		—			—
Total long-term investments	$	16,059	$	(7	)	$	16,052	$	20,405	$	(100	)	$	20,305

Schedule of Available-for-sale Securities Reconciliation

The adjusted cost and fair value of available-for-sale investments as of December 31, 2018 by contractual maturity were as follows (in thousands):

	Cost		Fair Value
Due in 1 year or less	$	111,716	$	111,612
Due in 1-2 years	16,059		16,052
Investments not due at a single maturity date	5,052		5,052
Total	$	132,827	$	132,716