Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Valuation of the Company's Investments by Fair Value Hierarchy

The following tables summarize the valuation of the Company’s investments by the fair value hierarchy:

	June 30, 2019
	Level I		Level II		Level III		Total
U.S. Treasury Securities	$	—	$	3,275	$	—	$	3,275
Common Stock		1,412		—		—		1,412
Total Investments	$	1,412	$	3,275	$	—	$	4,687
	December 31, 2018
	Level I		Level II		Level III		Total
U.S. Treasury Securities	$	—	$	3,297	$	—	$	3,297
Common Stock		2,157		—		—		2,157
Total Investments	$	2,157	$	3,297	$	—	$	5,454