Net Income (Loss) per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net Income (loss) per share — Basic:
Net income (loss)	$ 8,817	$ (10,974)	$ (10,974)
Less: Undistributed earnings to preferred stockholders	(639)
Net income (loss) applicable to common stockholders	$ 8,178	$ (10,974)
Denominator for basic net income (loss) per share	30,300	27,676
Basic net income (loss) per common share	$ 0.27	$ (0.40)	$ (0.40)
Loss per share — Diluted:
Net income (loss)	$ 8,817	$ (10,974)	$ (10,974)
Less: Warrant revaluation income for dilutive warrants	(1,101)
Less: Undistributed earnings to preferred stockholders	(517)
Numerator for diluted net income (loss) per share	$ 7,199	$ (10,974)
Denominator for basic net income (loss) per share	30,300	27,676
Plus: Incremental shares underlying “in the money” warrants outstanding	2,710
Denominator for diluted net income (loss) per share	33,010	27,676	27,676
Diluted net income (loss) per common share	$ 0.22	$ (0.40)	$ (0.40)