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Basis of Presentation - Change in Accounting Policy - Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2016
--- | --- | --- | ---
Accounting Changes |  |  |
Contract assets | $ 7,441 | $ 160 |
Deferred cost of sales | 2,986 | 15,994 |
Deferred income taxes | 2,183 | 3,047 |
Accrued expenses and other current liabilities | 40,430 | 58,068 |
Customer deposits and deferred revenue | 64,443 | 112,032 |
Additional paid-in capital | 1,060,733 | 1,051,953 |
Accumulated deficit | $ (475,284) | (212,870) |
Accounting Standards Update 2014-09, Revenue from Contracts with Customers | Previously Reported |  |  |
Accounting Changes |  |  |
Deferred cost of sales |  | 16,060 |
Deferred income taxes |  | 2,953 |
Accrued expenses and other current liabilities |  | 60,339 |
Customer deposits and deferred revenue |  | 108,953 |
Additional paid-in capital |  | 1,053,079 |
Accumulated deficit |  | (213,376) |
Accounting Standards Update 2014-09, Revenue from Contracts with Customers | Adjustments for adoption of guidance |  |  |
Accounting Changes |  |  |
Contract assets |  | 160 |
Deferred cost of sales |  | (66) |
Deferred income taxes |  | 94 |
Accrued expenses and other current liabilities |  | (2,271) |
Customer deposits and deferred revenue |  | 3,079 |
Additional paid-in capital |  | (1,126) |
Accumulated deficit |  | $ 506 | $ 6,900

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