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Property and Equipment, Net | 9 Months Ended
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Sep. 30, 2019
Property Plant And Equipment [Abstract] |
Property and Equipment, Net | 5. Property and Equipment, Net Property and equipment consists of the following:
|  | At September 30, 2019 |  |  | At December 31, 2018 |
Computer equipment |  | $ | 7,905 |  |  | $ | 4,208 |
Capitalized software |  |  | 181 |  |  |  | 252 |
Capitalized website development costs |  |  | 9,767 |  |  |  | 6,907 |
Furniture and fixtures |  |  | 6,648 |  |  |  | 4,584 |
Leasehold improvements |  |  | 19,483 |  |  |  | 10,821 |
Construction in progress |  |  | — |  |  |  | 8,971 |
Finance lease right-of-use assets |  |  | 88 |  |  |  | — |
|  |  | 44,072 |  |  |  | 35,743 |
Less accumulated depreciation and amortization |  |  | (16,504 | ) |  |  | (11,474 | )
Property and equipment, net |  | $ | 27,568 |  |  | $ | 24,269 |
Depreciation and amortization expense, excluding amortization of intangible assets, was $1,951, $1,308, $5,173 and $3,765 for the three months ended September 30, 2019 and 2018 and for the nine months ended September 30, 2019 and 2018, respectively. The increase of $8,662 in leasehold improvements and the decrease of $8,971 in construction in progress at September 30, 2019 were primarily due to costs incurred to build out the Company’s new leased facility at 121 First St. in Cambridge, Massachusetts. The facility became occupied subsequent to December 31, 2018 at which time the assets ceased to be classified as construction in progress and became classified as leasehold improvement.

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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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