Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Jul. 16, 2019	Sep. 30, 2019
Temporary Equity [Line Items]
Issuance of Series B Convertible Preferred Stock		$ 175,000
Preferred stock, conversion price per share	$ 4.00	$ 4.00
Series A 10% Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred stock issued/ sold	210,000
Face value of convertible preferred stock issued	$ 210,000
Fair value of convertible preferred stock issued	$ 200,000
Preferred stock, quarterly dividends rate		10.00%
Series B 10% Convertible Preferred Stock
Temporary Equity [Line Items]
Convertible preferred stock issued/ sold	175,000
Issuance of Series B Convertible Preferred Stock	$ 175,000
Preferred stock, quarterly dividends rate	10.00%	10.00%