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Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net loss $ (2,042) $ (4,007) $ (2,649) $ (9,262)
Weighted-average shares of common stock outstanding (in shares) 57,903 54,723 57,453 54,208
Basic and diluted (in USD per share) $ (0.04) $ (0.07) $ (0.05) $ (0.17)