Equity - Stock Option Activity (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares
Number of Options
Number of Options, Beginning Balance | shares	6,000,000
Number of Options, Granted | shares	340,000
Number of Options, Exercised | shares	(10,000)
Number of Options, Forfeited | shares	(100,000)
Number of Options, Expired | shares	(855,000)
Number of Options, Ending Balance | shares	5,375,000	6,000,000
Number of Options, Exercisable | shares	4,888,000
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning Balance	$ 1.33
Weighted Average Exercise Price, Granted	0.73
Weighted Average Exercise Price, Exercised	0.51
Weighted Average Exercise Price, Forfeited	1.70
Weighted Average Exercise Price, Expired	1.65
Weighted Average Exercise Price, Ending Balance	1.18	$ 1.33
Weighted Average Exercise Price, Exercisable	$ 1.25
Weighted Average Remaining Contractual Life, Outstanding	6 years 21 days	5 years 4 months 24 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0.73
Weighted Average Remaining Contractual Life, Exercisable	5 years 8 months 26 days
Aggregate Intrinsic Value, Outstanding | $	$ 219,000
Aggregate Intrinsic Value, Exercisable | $	$ 152,000