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3. Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Numerator:          
Net loss $ (13,513) $ (21,616) $ (32,097) $ (51,078) $ (77,141)
Denominator:          
Weighted-average common shares, basic 11,913 10,016 11,907 10,016  
Dilutive effect of stock options 0 0 0 0  
Weighted-average common shares, diluted 11,913 10,016 11,907 10,016  
Net loss per share, basic and diluted $ (1.13) $ (2.16) $ (2.70) $ (5.10)