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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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Net loss (numerator):                
Net loss $ (10,547) $ (12,858) $ (2,373) $ (3,937) $ (3,313) $ (4,146) $ (25,778) $ (11,396)
Loss per share:                
Basic and diluted (in dollars per share) $ (0.14)     $ (0.10)     $ (0.34) $ (0.30)
Shares (denominator):                
Weighted average common shares outstanding - basic (in shares) 75,405     38,253     75,597 38,210
Weighted average common shares outstanding - diluted (in shares) 75,405     38,253     75,597 38,210