4. Short Term Investments

12 Months Ended

Dec. 31, 2015

Schedule of Investments [Abstract]

Short Term Investments

The amortized cost and fair value of short term investments as of December 31, 2015 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	1,401,904	$	—	$	(451	)	$	1,401,453
Commercial paper	249,888		—			—		249,888
Total marketable securities	$	1,651,792	$	—	$	(451	)	$	1,651,341

As of December 31, 2015, there are no short term investments, classified and accounted for as available-for-sale securities that have been in a continuous unrealized loss position in excess of twelve months.

As of December 31, 2015, the amortized cost and fair value of short term investments by contractual maturity were as follows:

	Amortized Cost		Fair Value
Due in 1 year or less	$	1,651,792	$	1,651,341
Total marketable securities	$	1,651,792	$	1,651,341

The amortized cost and fair value of short term investments as of December 31, 2014 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	6,806,150	$	—	$	(6,448	)	$	6,799,702
Commercial paper	599,934		—		$	—		599,934
Total marketable securities	$	7,406,084	$	—	$	(6,448	)	$	7,399,636