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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Schedule of Fair Value by Significant Investment Category | The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash, or available-for-sale securities as of June 30, 2020 and December 31, 2019.
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as: |  |  |  |  |  |
June 30, 2020 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale securities |  |  |  | Long- term Restricted Cash
Cash |  | $ | 17,036 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,036 |  |  | $ | 14,849 |  |  | $ | — |  |  |  |  | $ | 2,187 |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 251,805 |  |  | — |  |  | — |  |  | 251,805 |  |  | 245,145 |  |  | — |  |  |  |  | 6,660 |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 137,047 |  |  | 404 |  |  | (13) |  |  | 137,438 |  |  | — |  |  | 137,438 |  |  |  |  | — |
U.S. treasury securities |  | 495,473 |  |  | 905 |  |  | (16) |  |  | 496,362 |  |  | — |  |  | 496,362 |  |  |  |  | — |
U.S. government agency securities |  | 50,866 |  |  | 26 |  |  | (6) |  |  | 50,886 |  |  | — |  |  | 50,886 |  |  |  |  | — |
Commercial paper |  | 124,410 |  |  | 1 |  |  | — |  |  | 124,411 |  |  | 53,989 |  |  | 70,422 |  |  |  |  | — |
Subtotal |  | 807,796 |  |  | 1,336 |  |  | (35) |  |  | 809,097 |  |  | 53,989 |  |  | 755,108 |  |  |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 1,076,637 |  |  | $ | 1,336 |  |  | $ | (35) |  |  | $ | 1,077,938 |  |  | $ | 313,983 |  |  | $ | 755,108 |  |  |  |  | $ | 8,847 |
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as: |  |  |  |  |  |
December 31, 2019 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale securities |  |  |  | Long-term Restricted Cash
Cash |  | $ | 24,631 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,631 |  |  | $ | 24,631 |  |  | $ | — |  |  |  |  | $ | — |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 32,856 |  |  | — |  |  | — |  |  | 32,856 |  |  | 26,196 |  |  | — |  |  |  |  | 6,660 |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 84,054 |  |  | 22 |  |  | (30) |  |  | 84,046 |  |  | — |  |  | 84,046 |  |  |  |  | — |
U.S. treasury securities |  | 311,083 |  |  | 151 |  |  | (23) |  |  | 311,211 |  |  | — |  |  | 311,211 |  |  |  |  | — |
U.S. government agency securities |  | 95,380 |  |  | 17 |  |  | — |  |  | 95,397 |  |  | 22,549 |  |  | 72,848 |  |  |  |  | — |
Commercial paper |  | 95,467 |  |  | — |  |  | — |  |  | 95,467 |  |  | 65,600 |  |  | 29,867 |  |  |  |  | — |
Subtotal |  | 585,984 |  |  | 190 |  |  | (53) |  |  | 586,121 |  |  | 88,149 |  |  | 497,972 |  |  |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 643,471 |  |  | $ | 190 |  |  | $ | (53) |  |  | $ | 643,608 |  |  | $ | 138,976 |  |  | $ | 497,972 |  |  |  |  | $ | 6,660 |

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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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