Stockholders' Equity - Summary Information of 2019 ATM Program (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended				12 Months Ended
	Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020	[1]	Dec. 31, 2020
Stockholders Equity Note [Abstract]
Proceeds from the issuance of common shares through at-the-market offering, net of offering costs	$ 31,546,577	$ (262)	[1]	$ 27,125		$ 28,000,000
Common shares issued	718,306	0				560,000
Gross average sale price per share	$ 43.92					$ 50.00
Sales commissions	$ 473,199					$ 420,000
Offering costs	871,311					331,143
Net proceeds	$ 30,202,067					$ 27,248,857
Average price per share, net	$ 42.05					$ 48.66

[1] For the six months ended June 30, 2021, no common shares were issued, but the Company incurred offering costs in connection with the at-the-market offering.