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Net Loss per Common Share Narrative (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 1,271 978 1,302 959