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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
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (1,709) $ (9,152)
Change in current assets and liabilities:    
Increase in accounts receivable (9,036) (8,102)
Increase in prepaid expenses and other current assets (1,755) (47)
Increase in accounts payable 2,845 1,424
Decrease in deferred revenue (481) (1,131)
Net cash used in operating activities $ 754 (6,749)
ASU 2014-09 | As Previously Reported    
Cash flows from operating activities:    
Net loss   (9,154)
Change in current assets and liabilities:    
Increase in accounts receivable   (8,003)
Increase in prepaid expenses and other current assets   (308)
Increase in accounts payable   1,248
Decrease in deferred revenue   (791)
Net cash used in operating activities   (6,749)
ASU 2014-09 | Adjustments    
Cash flows from operating activities:    
Net loss   2
Change in current assets and liabilities:    
Increase in accounts receivable   (99)
Increase in prepaid expenses and other current assets   261
Increase in accounts payable   176
Decrease in deferred revenue   $ (340)