Annual report pursuant to Section 13 and 15(d)

Net Loss Per Common Share (Details)

v3.20.4
Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net loss $ (8,074) $ (42,130) $ (26,544) $ (25,932) $ (34,459) $ (23,454) $ (16,375) $ (14,097) $ (102,680) $ (88,385) $ (53,079)
Weighted average number of common shares outstanding (in shares)                 118,473,000 93,024,000 84,782,000
Net loss per common share (expressed in $ per share) $ (0.05) $ (0.34) $ (0.24) $ (0.23) $ (0.36) $ (0.25) $ (0.18) $ (0.16) $ (0.87) $ (0.95) $ (0.63)