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Net Income (Loss) Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Basic and Diluted EPS:                    
Net loss $ 1,523 $ (6,174) $ (8,281) $ (12,546) $ (2,230) $ (13,792) $ (17,984) $ (27,816) $ (25,478) $ (61,822)
Weighted-average common shares outstanding                 52,634 50,602
Weighted-average unvested restricted shares                 (20) (343)
Weighted-average common shares outstanding used to compute net loss per share                 52,614 50,259
Basic and diluted net loss per share (usd per share)                 $ (0.48) $ (1.23)