Common Stock (Summarizes the Company's remaining authorized shares available - (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Components Of Common Stock [Line Items]
Authorized shares	300,000,000	300,000,000
Common stock outstanding	160,022,000	158,645,000
Options Outstanding	6,240,000	6,000,000
Warrants Outstanding	7,116,000
Reserved for issuance under 2019 Plan	9,516,000
Available Shares	117,106,000
30 day
Components Of Common Stock [Line Items]
Average stock price	$ 0.48
60 day
Components Of Common Stock [Line Items]
Average stock price	0.57
90 day
Components Of Common Stock [Line Items]
Average stock price	$ 0.60