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3. Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Numerator:      
Net loss $ (18,584) $ (29,462) $ (77,141)
Denominator:      
Weighted-average common shares, basic 11,869 10,016  
Dilutive effect of stock options 0 0  
Weighted-average common shares, diluted 11,869 10,016  
Net loss per share, basic and diluted $ (1.57) $ (2.94)