Equity Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Sep. 29, 2017	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Warrant outstanding		3,700,000	5,800,000
Minimum [Member]
Class of Stock [Line Items]
Common stock exercise price		$ 1.16	$ 1.16
Maximum [Member]
Class of Stock [Line Items]
Common stock exercise price		$ 2.38	$ 2.38
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, conversion price per share	$ 1.14
Convertible preferred stock, terms of conversion		In the event that the trading price of the Company’s Common Stock for 20 consecutive trading days (as determined in the Certificate of Designation) exceeded 400% of the then effective Conversion Price of the Series B Preferred Stock (initially set at $1.14), the Company was able to force conversion of the Series B Preferred Stock into shares of Common Stock or elect to redeem the Series B Preferred Stock for cash.
Preferred stock threshold consecutive trading days	20 days
Trading price of common stock exceeds conversion price, percentage	400.00%
Convertible preferred stock, right to increase in dividend percentage upon stock price trigger	12.00%
Offering [Member] | Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, issued and sold to investors	5,500
Preferred stock, dividend rate	10.00%
Preferred stock, price per share	$ 1,000
Preferred stock, issued and sold to investors, purchase price	$ 5.5
Preferred stock, conversion price per share	$ 1.14
Preferred stock, shares converted into common stock	4,824,562
Preferred stock, dividend payment terms		The holders of Series B Preferred Stock were entitled to receive cumulative dividends out of funds legally available thereof at a rate of ten percent (10%) per annum, payable (i) when and as declared by the Board of Directors, in quarterly installments on March 1, June 1, September 1 and December 1, (ii) upon conversion into Common Stock with respect the Series B Preferred Stock being converted, and (iii) upon redemption of the Series B Preferred Stock by the Company.