Capital Stock - Description of Preferred Stock - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) Directors shares	Dec. 31, 2018 shares
Class Of Stock [Line Items]
Dividends declared | $	$ 0
Voting rights	The holders of Series B, Series D, and Series G are entitled to one vote for each share of common stock into which it would convert. The holders of Series I-1 and Series I-2 have no voting rights
Series I-2 Preferred stock [Member]
Class Of Stock [Line Items]
Percentage of share liquidation premium	1.00%
Series D Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares outstanding		43
Number of directors to be nominated and elected by preferred shareholders | Directors	2
Series D Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Preferred stock, shares outstanding	10
Series G Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares outstanding	5,000,000	5,000,000
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
Series G Preferred Stock [Member] | Minimum [Member]
Class Of Stock [Line Items]
Convertible Redeemable Preferred stock, shares outstanding	1,000,000