Common Stock (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Common Stock Activity

The following table provides the activity in the Equity Shelf Program for the three and twelve months ended December 31, 2018:

	Three Months Ended			Twelve Months Ended
	December 31,			December 31,
	2018	2017		2018		2017
Gross proceeds	—	$	29,999,922	$	85,149,976	$	41,776,795
Less: agent commissions	—	299,999		851,500		417,768
Net proceeds	—	$	29,699,923	$	84,298,476	$	41,359,027
Number of shares sold	—	358,630		1,145,705		505,707
Weighted average price per share	—	$	83.65	$	74.32	$	82.61