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Supplemental Consolidated Financial Statement Information – Impact of Adoption of Topic 606 on Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net loss | $ (24,407) | $ (31,790) | $ (38,333)
Deferred income tax (benefit) expense | (757) | 763 | (5,564)
Change in current assets and liabilities: |  |  |
Increase (decrease) in accounts receivable | 6,744 | (16,465) | 19,891
(Increase) decrease in prepaid expenses and other current assets | (2,664) | 278 | 4,242
(Decrease) increase in accounts payable | (798) | 1,207 | (4,878)
Increase (decrease) in deferred revenue | 4,187 | 929 | (7,523)
Net cash used in operating activities | $ 12,871 | (6,703) | 8,742
ASU 2014-09 | As Previously Reported |  |  |
Cash flows from operating activities: |  |  |
Net loss |  | (31,266) | (39,792)
Deferred income tax (benefit) expense |  |  | (6,053)
Change in current assets and liabilities: |  |  |
Increase (decrease) in accounts receivable |  | (16,696) | 19,669
(Increase) decrease in prepaid expenses and other current assets |  | 401 | 1,328
(Decrease) increase in accounts payable |  | 1,176 | (4,326)
Increase (decrease) in deferred revenue |  | 544 | (2,991)
Net cash used in operating activities |  | (6,703) | 8,742
ASU 2014-09 | Adjustments |  |  |
Cash flows from operating activities: |  |  |
Net loss |  | (524) | 1,459
Deferred income tax (benefit) expense |  |  | 489
Change in current assets and liabilities: |  |  |
Increase (decrease) in accounts receivable |  | 231 | 222
(Increase) decrease in prepaid expenses and other current assets |  | (123) | 2,914
(Decrease) increase in accounts payable |  | 31 | (552)
Increase (decrease) in deferred revenue |  | $ 385 | $ (4,532)

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