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Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | 7. Property and Equipment Property and equipment consisted of the following at December 31, 2019 and 2020 (in thousands):
|  |  |  | December 31,
|  | Lives in years |  | 2019 |  | 2020
Leasehold improvements |  | 5 to 15 |  | $ | 824 |  | $ | 409
Research and laboratory equipment |  | 3 to 5 |  |  | 4,287 |  |  | —
Office equipment and furniture |  | 3 to 5 |  |  | 1,169 |  |  | 583
|  |  |  |  | 6,280 |  |  | 992
Less: accumulated depreciation and amortization |  |  |  |  | (6,253) |  |  | (886)
|  |  |  | $ | 27 |  | $ | 106
Depreciation and amortization expense for property and equipment was $20,000 for each of the years ended December 31, 2019 and 2020. During the year ended December 31, 2020, the Company wrote-off fully depreciated assets which were no longer in use and had no associated re-sale value other than scrap value.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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