Financial Highlights - Schedule of Financial Highlights of the Company (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Investment Company Investment Income Loss From Operations Per Share [Abstract]
Net asset value, beginning of period	[1]	$ 16.63	[2]	$ 20.74		$ 51.81		$ 62.02	$ 74.51
Net investment income	[1]	1.67	[3]	3.02	[3]	3.22	[3]	6.40	8.64
Net realized gains (loss)	[1]	(20.16)		(2.37)		(4.39)		0.76	1.36
Net change in unrealized appreciation (depreciation)	[1]	16.00		(3.17)		(13.24)		(11.58)	(15.07)
Net increase (decrease) in net assets resulting from operations	[1]	(2.49)		(2.52)		(14.41)		(4.42)	(5.07)
Issuance of common stock	[1]	(1.03)		0.81		(10.66)
Accretion from share buybacks	[1]							0.51
Distributions declared from net investment income	[1],[4]	(1.95)		(2.40)		(6.00)		(6.30)	(7.42)
Net decrease resulting from distributions to common stockholders	[1]	(1.95)		(2.40)		(6.00)		(6.30)	(7.42)
Net asset value, end of period	[1]	11.16	[2]	16.63	[2]	20.74		51.81	62.02
Per share market value, end of period	[1]	$ 8.29		$ 18.48		$ 21.60		$ 46.68	$ 47.10
Shares outstanding, end of period	[1]	7,601,958		4,484,278		3,838,242		1,677,114	1,775,400
Total return based on net asset value	[1],[5]	(22.17%)		(8.03%)		(49.51%)		(4.64%)	(7.31%)
Total return based on market value	[1],[5]	(46.53%)		(1.27%)		(39.98%)		15.17%	(8.35%)
Ratio/Supplemental Data:
Net assets, end of period		$ 84,809		$ 74,556		$ 79,615		$ 86,889	$ 110,116
Ratio of total expenses to average net assets before waiver	[6]	22.14%		14.69%		25.84%		16.46%	9.96%
Ratio of total expenses to average net assets after waiver	[6],[7]	16.43%		14.69%		25.84%		16.46%	9.96%
Ratio of incentive fees to average net assets	[6]	0.66%		(4.91%)		1.68%		2.80%	0.13%
Ratio of net investment income to average net assets	[6],[7]	12.30%		14.02%		11.77%		11.18%	12.30%
Portfolio turnover		53.00%		66.00%		64.00%		81.00%	67.00%

[1] The per share data was derived by using the weighted average shares outstanding during the period, except where such calculations deviate from those specified under the instructions to Form N-2. Per share data and shares outstanding have been adjusted for the periods shown to reflect the six-for-one reverse stock split effected on February 28, 2022 on a retrospective basis, as described in Note 2.

[2] Authorized, issued and outstanding shares of common stock and net asset value per share have been adjusted for the periods shown to reflect the six-for-one reverse stock split effected on February 28, 2022 on a retroactive basis as described in Note 2.

[3] Weighted average shares outstanding and per share amounts have been adjusted for the periods shown to reflect the six-for-one reverse stock split effected on February 28, 2022 on a retroactive basis as described in Note 2.

[4] The per share data for distributions declared reflects the actual amount of distributions of record per share for the period.

[5] Total return based on net asset value is calculated as the change in net asset value per share, assuming the Company’s distributions were reinvested through its dividend reinvestment plan. Total return based on market value is calculated as the change in market value per share, assuming the Company’s distributions were reinvested through its dividend reinvestment plan. Total return does not include any estimate of a sales load or commission paid to acquire shares.

[6] Average net assets used in ratio calculations are calculated using monthly ending net assets for the period presented. For the years ending December 31, 2022, 2021, 2020, 2019 and 2018 average net assets were $85,029, $87,975, $60,884, $97,791, and $124,668, respectively.

[7] Ratio for the year ended December 31, 2022 reflects the impact of the incentive fee waiver described in Note 3.