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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments Debt And Equity Securities [Abstract]

Summary of Cash Equivalents and Available-for-Sale Securities

The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				(Losses)				Fair Value
December 31, 2018
Cash equivalents:
Money market funds		$	103,291			$	—			$	—			$	103,291
Total			103,291				—				—				103,291
Available-for-sale securities:
Commercial paper securities			177,353				—				(129	)			177,224
Corporate debt securities			63,981				—				(111	)			63,870
U.S. government-sponsored entity debt securities			18,640				—				(19	)			18,621
Total			259,974				—				(259	)			259,715
Total cash equivalents and available-for-sale securities		$	363,265			$	—			$	(259	)		$	363,006
December 31, 2017
Cash equivalents:
Money market funds		$	24,290			$	—			$	—			$	24,290
Commercial paper securities			4,595				—				—				4,595
Total			28,885				—				—				28,885
Available-for-sale securities:
Commercial paper securities			110,365				—				(118	)			110,247
Corporate debt securities			75,886				—				(131	)			75,755
U.S. government-sponsored entity debt securities			8,498				—				(6	)			8,492
Total			194,749				—				(255	)			194,494
Total cash equivalents and available-for-sale securities		$	223,634				—			$	(255	)		$	223,379

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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