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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Balance Sheet Details |
4. | Balance Sheet Details
Short-Term Investments The following is a summary of our short-term investments (in thousands):
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U.S. treasury bills and government agency obligations |  | $ | 20,110 |  |  | $ | 166 |  |  | $ | — |  |  | $ | 20,276 |
U.S. corporate debt |  |  | 11,505 |  |  |  | 42 |  |  |  | — |  |  |  | 11,547 |
Foreign corporate debt |  |  | 15,508 |  |  |  | 49 |  |  |  | — |  |  |  | 15,557 |
U.S. commercial paper |  |  | 13,997 |  |  |  | — |  |  |  | — |  |  |  | 13,997 |
Foreign commercial paper |  |  | 41,976 |  |  |  | — |  |  |  | — |  |  |  | 41,976 |
Total |  | $ | 103,096 |  |  | $ | 257 |  |  | $ | — |  |  | $ | 103,353 |
|  | December 31, 2019 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U.S. treasury bills and government agency obligations |  | $ | 140,567 |  |  | $ | 59 |  |  | $ | — |  |  | $ | 140,626 |
U.S. corporate debt securities |  |  | 80,159 |  |  |  | 11 |  |  |  | — |  |  |  | 80,170 |
Foreign corporate debt securities |  |  | 23,188 |  |  |  | 15 |  |  |  | — |  |  |  | 23,203 |
U.S. commercial paper |  |  | 32,801 |  |  |  | — |  |  |  | — |  |  |  | 32,801 |
Foreign commercial paper |  |  | 42,274 |  |  |  | — |  |  |  | — |  |  |  | 42,274 |
Total |  | $ | 318,989 |  |  | $ | 85 |  |  | $ | — |  |  | $ | 319,074 |
The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. We regularly monitor and evaluate the realizable value of our marketable securities. We did not recognize any impairment losses for the years ended December 31, 2020 and 2019. Unrealized gains and losses associated with our investments are reported in accumulated other comprehensive loss. For both years ended December 31, 2020 and 2019, we recorded $172,000 in net unrealized gains associated with our short-term investments. For the year ended December 31, 2018, we recorded $77,000 in net unrealized losses associated with our short-term investments. Realized gains and losses associated with our investments, if any, are reported in the statements of operations and comprehensive loss. We recognized $8,000 in realized gains during the year ended December 31, 2019. We did not recognize any realized gains or losses during the years ended December 31, 2020 and 2018. Inventory Inventory consists of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Raw materials |  | $ | 18,994 |  |  | $ | 6,635 |
Work in process |  |  | 6,847 |  |  |  | 12,571 |
Finished goods |  |  | 16,064 |  |  |  | 5,762 |
Total inventory |  | $ | 41,905 |  |  | $ | 24,968 |
As of December 31, 2020, total inventory included $37.8 million related to CINVANTI and $4.1 million related to SUSTOL. As of December 31, 2019, total inventory included $23.5 million related to CINVANTI and $1.5 million related to SUSTOL. In addition, cost of product sales for the years ended December 31, 2020 and 2019 included charges of $0.1 million and $3.3 million, respectively, resulting from the write-off of short-dated SUSTOL inventory. Property and Equipment Property and equipment, net consists of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Scientific equipment |  | $ | 29,135 |  |  | $ | 24,603 |
Leasehold improvements |  |  | 878 |  |  |  | 206 |
Computer equipment and software |  |  | 1,461 |  |  |  | 1,314 |
Furniture, fixtures and office equipment |  |  | 2,135 |  |  |  | 1,520 |
Property and equipment, gross |  |  | 33,609 |  |  |  | 27,643 |
Less: accumulated depreciation and amortization |  |  | (10,872 | ) |  |  | (8,025 | )
Property and equipment, net |  | $ | 22,737 |  |  | $ | 19,618 |
Depreciation and amortization expense for the years ended December 31, 2020, 2019 and 2018 was $2.8 million, $2.0 million and $1.5 million, respectively. As of December 31, 2020 and 2019, $14.1 million and $13.5 million of property and equipment, respectively, was in process and not depreciated during the respective years. Accrued Payroll and Employee Liabilities and Other Accrued Liabilities Accrued payroll and employee liabilities consist of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Accrued employee salaries and benefits |  | $ | 1,691 |  |  | $ | 3,047 |
Accrued bonuses |  |  | 8,479 |  |  |  | 9,545 |
Accrued vacation |  |  | 3,427 |  |  |  | 2,656 |
Total accrued payroll and employee liabilities |  | $ | 13,597 |  |  | $ | 15,248 |
Other accrued liabilities consist of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Accrued product sales allowances |  | $ | 24,571 |  |  | $ | 27,939 |
Accrued consulting and professional fees |  |  | 3,450 |  |  |  | 7,742 |
Accrued accounts payable |  |  | 104 |  |  |  | 310 |
Other accrued liabilities |  |  | 244 |  |  |  | 544 |
Total other accrued liabilities |  | $ | 28,369 |  |  | $ | 36,535 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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