Stockholders' Equity - Additional Information (Details)									1 Months Ended	9 Months Ended	12 Months Ended	16 Months Ended	101 Months Ended	239 Months Ended
	Aug. 02, 2022 USD ($) $ / shares shares	Feb. 06, 2019 USD ($)	Nov. 30, 2018	Oct. 30, 2018 USD ($) shares	Sep. 14, 2016 USD ($)	Dec. 14, 2015 USD ($)	Aug. 05, 2015 USD ($)	Apr. 08, 2004 $ / shares shares	Aug. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 shares	Mar. 31, 2021 shares	Jul. 22, 2019 $ / shares shares
Class Of Stock [Line Items]
Equity offerings of common stock | $	$ 30,000,000								$ 30,000,000	$ 30,000,000		$ 0		$ 2,240,067,000
Shares repurchased										128,522	198,084		15,593,120
Weighted-average price per share | $ / shares										$ 12.74	$ 11.6		$ 15.91
Cost of Shares Repurchased | $		$ 48,107,000		$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000			$ 1,638,000	$ 2,297,000		$ 248,107,000
Discount rate of average net asset value per share										17.59%	23.85%
Reverse stock split, conversion ratio				0.33
Reverse stock split, description			The Company’s Board of Directors approved a one-for-three reverse stock split of the Company’s common stock on October 30, 2018 which was effective as of close of business as of November 30, 2018 (the “Reverse Stock Split”).
Number of shares, reverse stock splits								20,700,000
Common stock, shares authorized										130,000,000	130,000,000	130,000,000	130,000,000	130,000,000			400,000,000
Common stock, par value | $ / shares	$ 0.001									$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001			$ 0.001
Common stock, shares issued	1,932,641									65,451,359	65,253,275	65,253,275	65,253,275	65,253,275	63,647,240	65,259,176
Share purchase price par value | $ / shares	$ 15.52							$ 15
Lock up period	2 years
Offering cost | $	$ 300,000
Common Stock
Class Of Stock [Line Items]
Reverse stock split, conversion ratio				0.33
Reverse stock split, description				On October 30, 2018, the Company’s Board of Directors approved a one-for-three reverse stock split of the Company’s common stock which was effective as of the close of business on November 30, 2018.
Fractional Shares
Class Of Stock [Line Items]
Shares repurchased													15,593,150
Weighted-average price per share | $ / shares													$ 15.91
Cost of Shares Repurchased inclusive commissions | $													$ 248,107,000
Number of shares, reverse stock splits				29