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Stockholders’ Equity and Earnings (Loss) per Share - Basic and Diluted Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Net loss (numerator):            
Net loss $ (12,858) $ (2,373) $ (3,313) $ (4,146) $ (15,231) $ (7,459)
Loss per share:            
Basic and diluted (in dollars per share) $ (0.17)   $ (0.09)   $ (0.20) $ (0.20)
Shares (denominator):            
Weighted average common shares outstanding - basic (in shares) 75,692   38,253   75,692 38,188
Weighted average common shares outstanding - diluted (in shares) 75,692   38,253   75,692 38,188