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Financial Instruments and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2020
Financial Instruments and Fair Value Measurements |
Schedule of amortized cost and estimated fair values for available-for-sale securities | Available-for-sale securities are summarized below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(In thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
Money market funds | ​ | $ | 430,144 | ​ | $ | — | ​ | $ | — | ​ | $ | 430,144
Total | ​ | $ | 430,144 | ​ | $ | — | ​ | $ | — | ​ | $ | 430,144
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(In thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
U.S. government securities | ​ | $ | 53,799 | ​ | $ | 35 | ​ | $ | — | ​ | $ | 53,834
U.S. commercial paper | ​ |  | 18,915 | ​ |  | — | ​ |  | — | ​ |  | 18,915
Money market funds | ​ |  | 233,992 | ​ |  | — | ​ |  | — | ​ |  | 233,992
Total | ​ | $ | 306,706 | ​ | $ | 35 | ​ | $ | — | ​ | $ | 306,741
Schedule of available-for-sale securities measured at fair value on a recurring basis | The estimated fair values were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated Fair Value Measurements as of September 30, 2020 Using:
​ | ​ | Quoted Price | ​ | Significant | ​ | ​ | ​ | ​ | ​
​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
Types of Instruments | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
(In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 430,144 | ​ | $ | — | ​ | $ | — | ​ | $ | 430,144
Equity investment - Armata Common Stock | ​ | ​ | 27,787 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 27,787
Equity investment - Armata Warrants | ​ | ​ | — | ​ | ​ | 20,167 | ​ | ​ | — | ​ | ​ | 20,167
Equity investment - Entasis Common Stock | ​ | ​ | 38,093 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 38,093
Equity investment - Entasis Warrants | ​ | ​ | — | ​ | ​ | 25,698 | ​ | ​ | — | ​ | ​ | 25,698
Total assets measured at estimated fair value | ​ | $ | 496,024 | ​ | $ | 45,865 | ​ | $ | — | ​ | $ | 541,889
Debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 Notes | ​ | $ | — | ​ | $ | 230,494 | ​ | $ | — | ​ | $ | 230,494
2025 Notes | ​ | ​ | — | ​ | ​ | 191,491 | ​ | ​ | — | ​ | ​ | 191,491
Total fair value of debt | ​ | $ | — | ​ | $ | 421,985 | ​ | $ | — | ​ | $ | 421,985
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated Fair Value Measurements as of December 31, 2019 Using:
​ | ​ | Quoted Price | ​ | Significant | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | in Active | ​ | Other | ​ | Significant | ​ | ​ | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
Types of Instruments | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
(In thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government securities | ​ | $ | — | ​ | $ | 53,834 | ​ | $ | — | ​ | $ | 53,834
U.S. commercial paper | ​ | ​ | — | ​ |  | 18,915 | ​ |  | — | ​ |  | 18,915
Money market funds | ​ | ​ | 233,992 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 233,992
Total assets measured at estimated fair value | ​ | $ | 233,992 | ​ | $ | 72,749 | ​ | $ | — | ​ | $ | 306,741
Debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 Notes | ​ | $ | — | ​ | $ | 243,394 | ​ | $ | — | ​ | $ | 243,394
2025 Notes | ​ | ​ | — | ​ | ​ | 208,976 | ​ | ​ | — | ​ | ​ | 208,976
Total fair value of debt | ​ | $ | — | ​ | $ | 452,370 | ​ | $ | — | ​ | $ | 452,370

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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 financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + 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 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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