Capital Stock - Series G Preferred Stock Transactions - Additional Information (Detail)					3 Months Ended
	Jan. 21, 2019 USD ($) shares	Mar. 12, 2013 shares	Jan. 22, 2013 shares	Mar. 09, 2012 USD ($) Directors $ / shares shares	Mar. 31, 2019 $ / shares shares	Dec. 31, 2018 shares
Class of Stock [Line Items]
Number of shares of common stock sold		33,334	67,500
Convertible common stock, conversion price | $ / shares					$ 1.75
Common Stock [Member]
Class of Stock [Line Items]
Conversion of debt, shares					599,000
Co-Chairman and Chief Executive Officer [Member] | Note Conversion Agreement [Member]
Class of Stock [Line Items]
Non-convertible promissory note, principal amount | $	$ 1,000,000
Accrued and unpaid interest | $	$ 49,000
Co-Chairman and Chief Executive Officer [Member] | Note Conversion Agreement [Member] | Common Stock [Member]
Class of Stock [Line Items]
Conversion of debt, shares	599,222
Series G Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, conversion price | $ / shares				$ 60.00	$ 9.70
Conversion ratio for each share				0.0167	0.1031
Number of directors to be nominated by preferred shareholders | Directors				2
Number of independent directors out of directors to be nominated by preferred shareholders | Directors				1
Preferred stock, shares issued					5,000,000	5,000,000
Preferred stock, shares outstanding					5,000,000	5,000,000
Series G Preferred Stock [Member] | Minimum [Member]
Class of Stock [Line Items]
Convertible Redeemable Preferred stock, shares outstanding				1,000,000
Series G Preferred Stock [Member] | AR Partners, LLC [Member]
Class of Stock [Line Items]
Number of shares of common stock sold				5,000,000
Issuance price per share | $ / shares				$ 1.00
Total proceeds | $				$ 5,000,000