Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Available for Sale Securities - Summary of Available for sale securities at Fair Value (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 68,721,526	$ 11,338,769
Gross Unrealized Gains	3,299	2,472
Gross Unrealized Losses	(54,556)
Fair Value	68,670,269	11,341,241
Amortized Cost	118,389,510	32,553,997
Fair Value	118,338,253	32,556,469
Cash and cash equivalents	49,667,984	21,215,228	24,603,000	1,641,000
Cash and cash equivalents, fair value	49,667,984	21,215,228
Certificates of deposit
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	10,014,977	1,330,132
Gross Unrealized Losses
Fair Value	10,014,977	1,330,132
U.S. Government debt securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	31,741,636	7,506,951
Gross Unrealized Gains	3,299	2,418
Gross Unrealized Losses	(25,976)
Fair Value	31,718,959	7,509,369
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,997,360
Fair Value	4,997,360
Corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	21,967,553	2,501,686
Gross Unrealized Gains		54
Gross Unrealized Losses	(28,580)
Fair Value	$ 21,938,973	$ 2,501,740