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Balance Sheet Details | 6 Months Ended
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Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Details |
3. Balance Sheet Details
Short-Term Marketable Securities
Short-term marketable securities, consisting of equity securities and debt securities, were as follows as of the dates indicated:
| June 30, 2020
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 1,598.7 |  |  | $ | 1.6 |  |  | $ | (0.1 | ) |  | $ | 1,600.2 |
Commercial paper | 295.3 |  |  | 0.2 |  |  | (0.2 | ) |  | $ | 295.3 |
Corporate debt | 83.1 |  |  | 0.2 |  |  | — |  |  | $ | 83.3 |
Total debt securities, available for sale | $ | 1,977.1 |  |  | $ | 2.0 |  |  | $ | (0.3 | ) |  | $ | 1,978.8 |
| December 31, 2019
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 675.6 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 676.0 |
Commercial paper | 248.1 |  |  | 0.1 |  |  | — |  |  | 248.2 |
Corporate debt | 163.0 |  |  | — |  |  | (0.1 | ) |  | 162.9 |
Total debt securities, available for sale | $ | 1,086.7 |  |  | $ | 0.5 |  |  | $ | (0.1 | ) |  | $ | 1,087.1 |
As of June 30, 2020 and December 31, 2019, all of our debt securities had contractual maturities of less than 12 months. Gross realized gains and losses on sales of our debt securities during the three and six months ended June 30, 2020 and 2019 were not significant. We periodically review our portfolio of debt securities to determine if any investment is impaired due to credit loss or other potential valuation concerns. For the debt securities where the fair value of the investment is less than the amortized cost basis, we have assessed at the individual security level for various quantitative factors including, but not limited to, the nature of the investments, changes in credit ratings, interest rate fluctuations, industry analyst reports, and the severity of impairment. Unrealized losses on available-for-sale debt securities as of June 30, 2020 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, we have no t recorded an allowance for credit losses. We do not intend to sell these investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity.
Inventory
Inventory was as follows as of the dates indicated:
(In millions) | June 30, 2020 |  | December 31, 2019
Raw materials | $ | 59.1 |  |  | $ | 64.9 |
Work-in-process | 15.0 |  |  | 11.1 |
Finished goods | 91.2 |  |  | 43.8 |
Total inventory | $ | 165.3 |  |  | $ | 119.8 |
During the three and six months ended June 30, 2020, we recorded excess and obsolete inventory charges of $1.7 million and $6.8 million, respectively, in cost of sales as a result of our ongoing assessment of sales demand, inventory on hand for each product and the continuous improvement and innovation of our products. During the three and six months ended June 30, 2019, we recorded excess and obsolete inventory charges of $1.7 million and $3.3 million, respectively, in cost of sales primarily as a result of our ongoing assessment of sales demand and inventory on hand.
Property and Equipment
Property and equipment was as follows as of the dates indicated:
(In millions) | June 30, 2020 |  | December 31, 2019
Building and land (1) | $ | 15.5 |  |  | $ | 15.5 |
Furniture and fixtures | 13.0 |  |  | 12.8 |
Computer software and hardware | 33.0 |  |  | 32.7 |
Machinery and equipment | 165.2 |  |  | 130.2 |
Leasehold improvements | 120.7 |  |  | 102.5 |
Construction in progress | 158.2 |  |  | 132.6 |
Total cost | 505.6 |  |  | 426.3 |
Less accumulated depreciation and amortization | (121.3 | ) |  | (105.0 | )
Total property and equipment, net | $ | 384.3 |  |  | $ | 321.3 |
(1)Represents our finance lease right-of-use assets.
Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities were as follows as of the dates indicated:
(In millions) | June 30, 2020 |  | December 31, 2019
Accounts payable trade | $ | 108.4 |  |  | $ | 102.3 |
Accrued tax, audit, and legal fees | 21.4 |  |  | 14.0 |
Accrued rebates | 147.5 |  |  | 93.3 |
Accrued warranty | 9.3 |  |  | 7.4 |
Other accrued liabilities | 29.3 |  |  | 39.4 |
Total accounts payable and accrued liabilities | $ | 315.9 |  |  | $ | 256.4 |
Other Long-Term Liabilities
Other long-term liabilities were as follows as of the dates indicated:
(In millions) | June 30, 2020 |  | December 31, 2019
Finance lease obligations | $ | 14.0 |  |  | $ | 14.4 |
Contractual obligations | 12.6 |  |  | — |
Other liabilities | 8.7 |  |  | 5.7 |
Total other liabilities | $ | 35.3 |  |  | $ | 20.1 |

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