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Net Income (Loss) Per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income (loss) per common share
Net income (loss)	$ 3,343,000	$ (6,125,000)	$ 9,032,000	$ (9,761,000)
Basic net income (loss) per common share	$ 0.39	$ (0.78)	$ 1.07	$ (1.25)
Diluted net income (loss) per common share	$ 0.39	$ (0.78)	$ 1.07	$ (1.25)

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