3. Marketable Securities

Marketable securities at September 30, 2018 consist of the following:

 

Marketable Securities		Amortized Cost				Unrealized Gains				Unrealized Losses				Fair Value
Current:
Corporate debt		$	26,664,512			$	54			$	(19,429	)		$	26,645,137

Marketable securities at December 31, 2017 consisted of the following:

 

Marketable Securities		Amortized Cost				Unrealized Gains				Unrealized Losses				Fair Value
Current:
Corporate debt		$	39,933,684			$	—			$	(74,820	)		$	39,858,864

At September 30, 2018 and December 31, 2017, the Company held only investments that have maturities of less than one year.

At September 30, 2018 and December 31, 2017, the Company held 26 and 32 debt securities, respectively, that individually and in total were in an immaterial unrealized loss position for less than one year. The aggregate fair value of debt securities in an unrealized loss position at September 30, 2018 and December 31, 2017 was $24,066,817 and $39,858,864, respectively. The Company evaluated its securities for other-than-temporary impairment and considered the decline in market value for the securities to be primarily attributable to current economic and market conditions. It is not more likely than not that the Company will be required to sell the securities prior to the recovery of the amortized cost basis. Based on this analysis, these marketable securities were not considered to be other-than-temporarily impaired as of September 30, 2018 and December 31, 2017.