4. Short Term Investments (Tables)

12 Months Ended

Dec. 31, 2014

Schedule of Investments [Abstract]

Amortized cost and fair value of short term investments

		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

Amortized cost and fair value of short term investments by contractual maturity

	Amortized Cost		Fair Value
Due in 1 year or less	$	6,804,123	$	6,798,892
Due in 1-2 years	601,961		600,744
Total marketable securities	$	7,406,084	$	7,399,636