Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share
Net Income (loss)	$ (5,179,000)	$ (5,812,000)
Less: decrease in fair value of investor warrants	(831,000)
Income (loss) available to common stockholders	$ (6,010,000)	$ (5,812,000)
Basic weighted-average common share outstanding	159,054,000	111,104,000
Add: dilutive effect of equity instruments	1,504,000
Diluted weighted-average shares outstanding	160,558,000	111,104,000
Earnings per share - basic	$ (0.03)	$ (0.05)
Earnings per share - diluted	$ (0.04)	$ (0.05)