Cash equivalents and marketable securities (Tables)

6 Months Ended

Jun. 30, 2017

Cash and Cash Equivalents [Abstract]

Marketable securities at June 30, 2017 and December 31, 2016 consisted of the following:



	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
As of June 30, 2017
Current (due within 1 year):
U.S. government agency securities	$	8,001,815	$	—	$	(5,616	)	$	7,996,199
Total	$	8,001,815	$	—	$	(5,616	)	$	7,996,199



	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
As of December 31, 2016
Current (due within 1 year):
U.S. government agency securities	$	31,060,710	$	2,912	$	(4,131	)	$	31,059,491
Commercial paper	6,081,202		—		—			6,081,202
Corporate debt securities	1,518,635		—		(395		)	1,518,240
Total	$	38,660,547	$	2,912	$	(4,526	)	$	38,658,933

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details