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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION – Impact of Adoption of Topic 606 on Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
May 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Common stock dividend declared, percentage of shares outstanding 5.00%        
Current assets:          
Accounts receivable, net   $ 27,895 $ 33,156    
Prepaid expenses and other current assets   11,816 7,340    
Current liabilities:          
Deferred revenue   7,103 6,314 $ 8,995 $ 5,385
Stockholders' equity:          
Common Stock   229 229    
Additional paid-in capital   152,548 151,881    
Retained deficit   $ (17,531) (10,012)    
Stock Dividend Adjustments          
Stockholders' equity:          
Common Stock     11    
Additional paid-in capital     8,046    
Retained deficit     (8,057)    
ASU 2014-09 | As Previously Reported          
Current assets:          
Accounts receivable, net     33,138    
Prepaid expenses and other current assets     4,677    
Current liabilities:          
Deferred revenue     3,699    
Stockholders' equity:          
Common Stock     218    
Additional paid-in capital     143,835    
Retained deficit     (2,021)    
ASU 2014-09 | Adjustments          
Current assets:          
Accounts receivable, net     18    
Prepaid expenses and other current assets     2,663    
Current liabilities:          
Deferred revenue     2,615    
Stockholders' equity:          
Retained deficit     $ 66