Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Common Stock - Additional Information (Detail)

Shareholders' Equity - Common Stock - Additional Information (Detail)								12 Months Ended
	Jul. 17, 2018 USD ($) $ / shares shares	Jun. 22, 2018 USD ($) shares	Apr. 06, 2018 $ / shares shares	Mar. 09, 2018 shares	Jan. 08, 2018 $ / shares shares	Dec. 01, 2017	Feb. 09, 2017 shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Jan. 19, 2018 shares	Jan. 31, 2017 shares	Dec. 31, 2016 shares
Class of Stock [Line Items]
Number of authorized shares of all classes of our capital stock											120,000,000
Common stock, shares authorized								200,000,000	200,000,000	45,000,000	100,000,000
Stock issued during period shares reverse stock splits ratio					0.10
Common stock par value \| $ / shares			$ 0.001		$ 0.001			$ 0.001	$ 0.001
Effective date of common stock split					Jan. 19, 2018
Common stock, shares outstanding								29,433,135	4,928,335	4,900,000
Preferred stock, shares authorized								50,000,000	50,000,000			20,000,000
Fractional share from reverse stock split					0
Warrants granted	13,800,000		900,000
Warrants exercise price per share \| $ / shares			$ 2.00
Shares of stock issued during period			900,000
Share price per unit \| $ / shares			$ 2.00
Term of warrants			5 years
Non-exercisable term of warrants			6 months
Net proceeds from public offering \| $	$ 12,400,000
Proceeds from public offering \| $	$ 13,800,000							$ 13,800,000
Recognized compensation expense relating to restricted stock awards \| $								$ 24,320	$ 123,200
Class of warrants exercised								9,505,500
Frederick Telling [Member]
Class of Stock [Line Items]
Shares of stock issued during period	100,000
Shares of common stock callable by warrants issued	100,000
Alan Dunton [Member]
Class of Stock [Line Items]
Shares of stock issued during period	20,000
Shares of common stock callable by warrants issued	20,000
Non-employee Directors [Member] \| 2012 Equity Incentive Plan [Member]
Class of Stock [Line Items]
Recognized compensation expense relating to restricted stock awards \| $		$ 24,320							$ 123,200
Non-employee Directors [Member] \| 2012 Equity Incentive Plan [Member] \| Restricted Stock [Member]
Class of Stock [Line Items]
Restricted shares awarded to each non-employee director		4,000					4,000
Restricted shares vested for each non-employee director		4,000							4,000
Underwriter [Member]
Class of Stock [Line Items]
Warrants granted	1,800,000
Shares of stock issued during period	1,800,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding								29,433,135	4,928,335			4,912,335
Shares of stock issued during period	4,436,000							4,436,000
Share price per unit \| $ / shares	$ 3.00
Proceeds from public offering \| $	$ 2,300,000
Issuance of common stock in exchange for services, Shares								25,000
Warrant exercises, Shares								9,505,500
Warrant [Member]
Class of Stock [Line Items]
Proceeds from public offering \| $	$ 6,500,000
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Shares of stock issued during period	9,364,000
Convertible preferred stock, number of shares of common stock	9,364,000
Proceeds from public offering \| $	$ 5,000,000
Deemed dividend \| $	$ 1,400,000							$ 1,412,041
Convertible into shares of common stock								9,364,000
Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of preferred stock converted				2,583,000
Common Stock [Member]
Class of Stock [Line Items]
Total preferred stock issued				258,300
Scenario, Previously Reported [Member]
Class of Stock [Line Items]
Common stock, shares authorized									450,000,000
Common stock, shares outstanding									49,000,000
Minimum [Member]
Class of Stock [Line Items]
Stock issued during period shares reverse stock splits ratio						0.2
Maximum [Member]
Class of Stock [Line Items]
Stock issued during period shares reverse stock splits ratio						0.1
Amendment [Member]
Class of Stock [Line Items]
Number of authorized shares of all classes of our capital stock											270,000,000
Common stock, shares authorized		200,000,000									250,000,000
Amendment Two [Member]
Class of Stock [Line Items]
Common stock, shares authorized									450,000,000
Capital Unit, Class A [Member]
Class of Stock [Line Items]
Warrants exercise price per share \| $ / shares	$ 1.00
Share price per unit \| $ / shares	$ 1.00
Number of common shares issued with each capital unit	1
Common stock warrants term	7 years
Number of warrants issued with each capital unit	1
Capital Unit, Class B [Member]
Class of Stock [Line Items]
Share price per unit \| $ / shares	$ 1.00
Capital Unit, Class B [Member] \| Series D Preferred Stock [Member]
Class of Stock [Line Items]
Number of warrants issued with each capital unit	1
Number of preferred shares issued with each capital unit	1
Shares of common stock callable by warrants issued	1