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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
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)