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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Summary of the valuation of cash equivalents and marketable securities by pricing levels

The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of December 31, 2019 and 2018:

	As of December 31, 2019
	Total				Quoted Market Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	(In thousands)
Money market funds	$	10,065			$	10,065			$	—			$	—
U.S. Government bonds and notes	39,086				—				39,086				—
Corporate notes, bonds, commercial paper and other	314,391				—				314,391				—
Total available-for-sale securities	$	363,542			$	10,065			$	353,477			$	—

	As of December 31, 2018
	Total				Quoted Market Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
	(In thousands)
Money market funds	$	10,080			$	10,080			$	—			$	—
U.S. Government bonds and notes	32,630				—				32,630				—
Corporate notes, bonds, commercial paper and other	183,998				—				183,998				—
Total available-for-sale securities	$	226,708			$	10,080			$	216,628			$	—

Financial instruments not carried at fair value but requiring fair value disclosure

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2019 and 2018:

	As of December 31, 2019												As of December 31, 2018
(in thousands)	Face Value				Carrying Value				Fair Value				Face Value				Carrying Value				Fair Value
1.375% Convertible Senior Notes due 2023	$	172,500			$	148,788			$	174,239			$	172,500			$	141,934			$	150,075

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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