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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Measurements [Abstract] |
Assets Measured at Fair Value on a Recurring Basis | The following tables present the major security types we held at March 31, 2020 and December 31, 2019 that we regularly measure and carry at fair value. At March 31, 2020 and December 31, 2019, a portion of our ProQR investment was subject to trading restrictions that extend to the fourth quarter of 2020; as a result, we included a lack of marketability discount in valuing this investment, which is a Level 3 input. The amount we owned in ProQR did not change from December 31, 2019 to March 31, 2020. The tables below segregate each security type by the level within the fair value hierarchy of the valuation techniques we utilized to determine the respective securities’ fair value (in thousands):
|  | At March 31, 2020 |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash equivalents (1) |  | $ | 336,371 |  |  | $ | 336,371 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (2) |  |  | 1,216,187 |  |  |  | — |  |  |  | 1,216,187 |  |  |  | — |
Debt securities issued by U.S. government agencies (3) |  |  | 334,225 |  |  |  | — |  |  |  | 334,225 |  |  |  | — |
Debt securities issued by the U.S. Treasury (4) |  |  | 420,445 |  |  |  | 420,445 |  |  |  | — |  |  |  | — |
Debt securities issued by states of the U.S. and political subdivisions of the states (5) |  |  | 34,574 |  |  |  | — |  |  |  | 34,574 |  |  |  | — |
Other municipal debt securities (5) |  |  | 907 |  |  |  | — |  |  |  | 907 |  |  |  | — |
Investment in ProQR Therapeutics N.V. (6) |  |  | 2,089 |  |  |  | 617 |  |  |  | — |  |  |  | 1,472 |
Total |  | $ | 2,344,798 |  |  | $ | 757,433 |  |  | $ | 1,585,893 |  |  | $ | 1,472 |
|  | At December 31, 2019 |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash equivalents (1) |  | $ | 418,406 |  |  | $ | 418,406 |  |  | $ | — |  |  | $ | — |
Corporate debt securities (7) |  |  | 1,102,568 |  |  |  | — |  |  |  | 1,102,568 |  |  |  | — |
Debt securities issued by U.S. government agencies (8) |  |  | 329,404 |  |  |  | — |  |  |  | 329,404 |  |  |  | — |
Debt securities issued by the U.S. Treasury (5) |  |  | 363,694 |  |  |  | 363,694 |  |  |  | — |  |  |  | — |
Debt securities issued by states of the U.S. and political subdivisions of the states (5) |  |  | 40,407 |  |  |  | — |  |  |  | 40,407 |  |  |  | — |
Investment in ProQR Therapeutics N.V. (6) |  |  | 4,506 |  |  |  | — |  |  |  | — |  |  |  | 4,506 |
Total |  | $ | 2,258,985 |  |  | $ | 782,100 |  |  | $ | 1,472,379 |  |  | $ | 4,506 |
The following footnotes reference lines on our condensed consolidated balance sheet:
(1) | Included in cash and cash equivalents.
(2) | $21.0 million was included in cash and cash equivalents, with the difference included in short-term investments.
(3) | $6.5 million was included in cash and cash equivalents, with the difference included in short-term investments.
(4) | $81 million was included in cash and cash equivalents, with the difference included in short-term investments.
(5) | Included in short-term investments.
(6) | Included in other current assets.
(7) | $19.0 million was included in cash and cash equivalents, with the difference included in short-term investments.
(8) | $0.8 million was included in cash and cash equivalents, with the difference included in short-term investments.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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