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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Property and Equipment, Net | Note 4—Property and Equipment, Net Major classes of property and equipment were as follows (in thousands):
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
Computer equipment |  | $ | 2,542 |  |  | $ | 4,520 |
Purchased software |  |  | 6,686 |  |  |  | 7,735 |
Furniture and fixtures |  |  | 2,563 |  |  |  | 4,306 |
Construction in progress |  |  | 2,319 |  |  |  | 102 |
Leasehold improvements |  |  | 4,374 |  |  |  | 9,645 |
|  |  | 18,484 |  |  |  | 26,308 |
Less: Accumulated depreciation |  |  | (3,705 | ) |  |  | (8,903 | )
|  | $ | 14,779 |  |  | $ | 17,405 |
Depreciation expense for 2015, 2016 and 2017 was $1.0 million, $2.4 million and $5.3 million respectively. The Company has purchased software under a financing arrangement where the Company makes installment payments over a four-year period. The Company has taken possession of the software and runs the software on its own equipment. As of December 31, 2016 and 2017, the software had a cost basis of $1.8 million. Accumulated depreciation on this software as of December 31, 2016 and 2017 was $0.9 million and $1.2 million, respectively. Depreciation expense on this software was $0.4 million for 2015, 2016 and 2017. To date, there have been no impairment charges to property and equipment.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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