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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION – Impact of Adoption of Topic 606 on Condensed Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (12,591) $ (27,002)
Change in current assets and liabilities:    
Increase in accounts receivable 2,491 (9,371)
(Increase) decrease in prepaid expenses and other current assets 883 166
Increase in accounts payable 1,110 2,267
Increase (decrease) in deferred revenue (3,535) (799)
Net cash used in operating activities $ 12,772 (3,309)
ASU 2014-09 | As Previously Reported    
Cash flows from operating activities:    
Net loss   (26,722)
Change in current assets and liabilities:    
Increase in accounts receivable   (9,568)
(Increase) decrease in prepaid expenses and other current assets   (1,135)
Increase in accounts payable   2,197
Increase (decrease) in deferred revenue   489
Net cash used in operating activities   (3,309)
ASU 2014-09 | Adjustments    
Cash flows from operating activities:    
Net loss   (280)
Change in current assets and liabilities:    
Increase in accounts receivable   197
(Increase) decrease in prepaid expenses and other current assets   1,301
Increase in accounts payable   70
Increase (decrease) in deferred revenue   $ (1,288)