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Organization and Significant Accounting Policies - Adoption of New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
ASSETS |  |  |  |
Accounts receivable, net | $ 39,202 |  | $ 45,700 | $ 28,800
Deferred commissions | 3,845 |  | 3,026 | 2,376
Deferred commissions, non-current | 5,489 |  | 4,655 | 0
Liabilities |  |  |  |
Accrued expenses and other current liabilities | 26,383 |  | 27,168 | 20,212
Deferred revenue | 110,943 |  | 111,309 | 104,684
Deferred revenue, non-current | 20,968 |  | 22,952 | 22,709
Accumulated deficit | (266,574) |  | (256,956) | (265,337)
Revenue |  |  |  |
Subscription and support | 46,470 | $ 39,540 |  |
Professional services | 13,436 | 12,364 |  |
Operating expenses |  |  |  |
Sales and marketing | 21,006 | 18,713 |  |
Net loss | $ (9,618) | $ (5,836) |  |
Net loss per common share: |  |  |  |
Basic and diluted (in dollars per share) | $ (0.22) | $ (0.14) |  |
Balances Without Adoption of ASC 606 |  |  |  |
ASSETS |  |  |  |
Accounts receivable, net | $ 26,863 |  |  | 28,800
Deferred commissions | 2,434 |  |  | 2,376
Deferred commissions, non-current | 0 |  |  | 0
Liabilities |  |  |  |
Accrued expenses and other current liabilities | 19,532 |  |  | 20,212
Deferred revenue | 107,118 |  |  | 104,684
Deferred revenue, non-current | 20,941 |  |  | 22,709
Accumulated deficit | (275,110) |  |  | $ (265,337)
Revenue |  |  |  |
Subscription and support | 46,237 |  |  |
Professional services | 15,130 |  |  |
Operating expenses |  |  |  |
Sales and marketing | 22,622 |  |  |
Net loss | $ (9,773) |  |  |
Net loss per common share: |  |  |  |
Basic and diluted (in dollars per share) | $ (0.23) |  |  |
Accounting Standards Update 2014-09 | Effect of Change |  |  |  |
ASSETS |  |  |  |
Accounts receivable, net | $ 12,339 |  | 16,900 |
Deferred commissions | 1,411 |  | 650 |
Deferred commissions, non-current | 5,489 |  | 4,655 |
Liabilities |  |  |  |
Accrued expenses and other current liabilities | 6,851 |  | 6,956 |
Deferred revenue | 3,825 |  | 6,625 |
Deferred revenue, non-current | 27 |  | 243 |
Accumulated deficit | 8,536 |  | $ 8,381 |
Revenue |  |  |  |
Subscription and support | 233 |  |  |
Professional services | (1,694) |  |  |
Operating expenses |  |  |  |
Sales and marketing | (1,616) |  |  |
Net loss | $ 155 |  |  |
Net loss per common share: |  |  |  |
Basic and diluted (in dollars per share) | $ 0.01 |  |  |

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