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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Available-For-Sale Debt Securities | Available-for-sale debt securities consisted of the following:
| December 31, |
(in thousands) | 2019 |  |  | 2018 |
Commercial paper | $ | 144,472 |  |  | $ | 94,572 |
Corporate debt securities |  | 521,946 |  |  |  | 544,978 |
Securities of government-sponsored entities |  | 191,481 |  |  |  | 85,677 |
Total marketable securities | $ | 857,899 |  |  | $ | 725,227 |
Amortized Cost, Gross Unrealized Gain (Loss) Positions and Estimated Fair Value for Available-For-Sale Debt Securities | The following table presents the amortized cost, gross unrealized gain (loss) positions and estimated fair value for available-for-sale debt securities, aggregated by investment category.
(in thousands) | Contractual Maturity (in years) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Aggregate Estimated Fair Value |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classified as current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | Less than 1 |  | $ | 144,460 |  |  | $ | 27 |  |  | $ | (15 | ) |  | $ | 144,472 |
Corporate debt securities | Less than 1 |  |  | 270,485 |  |  |  | 557 |  |  |  | (42 | ) |  |  | 271,000 |
Securities of government-sponsored entities | Less than 1 |  |  | 142,351 |  |  |  | 422 |  |  |  | — |  |  |  | 142,773 |
blank |  |  | $ | 557,296 |  |  | $ | 1,006 |  |  | $ | (57 | ) |  | $ | 558,245 |
Classified as non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 1 to 2 |  | $ | 250,499 |  |  | $ | 515 |  |  | $ | (68 | ) |  | $ | 250,946 |
Securities of government-sponsored entities | 1 to 2 |  |  | 48,691 |  |  |  | 19 |  |  |  | (2 | ) |  |  | 48,708 |
blank |  |  | $ | 299,190 |  |  | $ | 534 |  |  | $ | (70 | ) |  | $ | 299,654 |
blank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classified as current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | Less than 1 |  | $ | 94,617 |  |  | $ | — |  |  | $ | (45 | ) |  | $ | 94,572 |
Corporate debt securities | Less than 1 |  |  | 395,385 |  |  |  | — |  |  |  | (1,598 | ) |  |  | 393,787 |
Securities of government-sponsored entities | Less than 1 |  |  | 20,887 |  |  |  | 8 |  |  |  | (55 | ) |  |  | 20,840 |
blank |  |  | $ | 510,889 |  |  | $ | 8 |  |  | $ | (1,698 | ) |  | $ | 509,199 |
Classified as non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 1 to 2 |  | $ | 151,594 |  |  | $ | 66 |  |  | $ | (469 | ) |  | $ | 151,191 |
Securities of government-sponsored entities | 1 to 2 |  |  | 64,676 |  |  |  | 162 |  |  |  | (1 | ) |  |  | 64,837 |
blank |  |  | $ | 216,270 |  |  | $ | 228 |  |  | $ | (470 | ) |  | $ | 216,028 |
Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position | The following table presents the estimated fair value and gross unrealized loss position for available-for-sale debt securities, aggregated by investment category and length of time that such securities have been in a continuous loss position.
| Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
(in thousands) | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 33,070 |  |  | $ | (15 | ) |  | $ | — |  |  | $ | — |  |  | $ | 33,070 |  |  | $ | (15 | )
Corporate debt securities |  | 186,052 |  |  |  | (110 | ) |  |  | — |  |  |  | — |  |  |  | 186,052 |  |  |  | (110 | )
Securities of government-sponsored entities |  | 15,002 |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 15,002 |  |  |  | (2 | )
blank | $ | 234,124 |  |  | $ | (127 | ) |  | $ | — |  |  | $ | — |  |  | $ | 234,124 |  |  | $ | (127 | )
blank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | $ | 51,927 |  |  | $ | (45 | ) |  | $ | — |  |  | $ | — |  |  | $ | 51,927 |  |  | $ | (45 | )
Corporate debt securities |  | 274,696 |  |  |  | (746 | ) |  |  | 234,798 |  |  |  | (1,321 | ) |  |  | 509,494 |  |  |  | (2,067 | )
Securities of government-sponsored entities |  | 4,999 |  |  |  | (1 | ) |  |  | 10,947 |  |  |  | (55 | ) |  |  | 15,946 |  |  |  | (56 | )
blank | $ | 331,622 |  |  | $ | (792 | ) |  | $ | 245,745 |  |  | $ | (1,376 | ) |  | $ | 577,367 |  |  | $ | (2,168 | )

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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