Common Stock (Summary of Company's sales under the Equity Distribution Agreement) (Detail) - Sales Agreement [Member]	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Class of Stock [Line Items]
Total shares of common stock sold | shares	14,310,000
Average price per share | $ / shares	$ 0.55
Gross Proceeds	$ 7,913,000
Commissions earned by placement agent	(317,000)
Issuance / subsequent recurring fees	(243,000)
Net Proceeds	$ 7,353,000