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Summary of Business and Significant Accounting Policies - Financial Impact of ASU Adoption - Balance Sheet (Details) - USD ($) $ in Thousands | Jul. 01, 2019 | Dec. 31, 2018 | Jul. 02, 2018 | Jun. 30, 2018
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Financial impact of ASU adoption |  |  |  |
Accounts receivable, net |  | $ 16,178 | $ 22,213 | $ 7,389
Costs capitalized to obtain revenue contracts, net |  | 682 | 591 | 986
Costs capitalized to obtain revenue contracts, net of current portion |  | 1,904 | 1,824 | 891
Accrued liabilities |  | 1,746 | 2,345 | 2,285
Deferred revenue |  | 28,836 | 30,064 | 18,364
Deferred revenue, net of current portion |  | 6,136 | 7,411 | 7,833
Accumulated deficit |  | (346,840) | $ (349,444) | $ (353,260)
Impact |  |  |  |
Financial impact of ASU adoption |  |  |  |
Accounts receivable, net | $ 14,824 | (9,036) |  |
Costs capitalized to obtain revenue contracts, net | (395) | 315 |  |
Costs capitalized to obtain revenue contracts, net of current portion | 933 | (1,137) |  |
Accrued liabilities | 60 |  |  |
Deferred revenue | 11,700 | (61) |  |
Deferred revenue, net of current portion | (422) | (4,628) |  |
Accumulated deficit | $ 3,816 | 3,816 |  |
Excluding Topic 606 Impact |  |  |  |
Financial impact of ASU adoption |  |  |  |
Accounts receivable, net |  | 7,142 |  |
Costs capitalized to obtain revenue contracts, net |  | 997 |  |
Costs capitalized to obtain revenue contracts, net of current portion |  | 767 |  |
Deferred revenue |  | 28,775 |  |
Deferred revenue, net of current portion |  | 1,508 |  |
Accumulated deficit |  | $ (343,024) |  |

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