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Basis of Presentation and Summary of Significant Accounting Policies - Financials of Viking (Details) - Viking - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Condensed Statement of Operations:      
Total revenue $ 0 $ 0  
Gross profit 0 0  
Loss from operations 4,805 4,968  
Net Loss 3,551 $ 5,222  
Condensed Balance Sheet:      
Current assets 78,731   $ 21,852
Noncurrent assets 240   270
Total assets 78,971   22,122
Current liabilities 6,339   8,657
Noncurrent liabilities 0   0
Stockholder's equity $ 72,632   $ 13,465