Cash and cash equivalents and short-term investments.

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Cash And Cash Equivalents At Carrying Value And Available For Sale Securities Debt Securities Current.

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- Definition

Cash And Cash Equivalents At Carrying Value Available And Available For Sale Debt Securities Amortized Cost Basis.

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Cash equivalents at carrying value and available for sale debt securities amortized cost basis.

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Cash equivalents at carrying value and available for sale securities debt securities current.

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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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Amount of 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, Cash Equivalents and Short-Term Investments - Schedule of Cash and Cash Equivalents and Short-term Investments by Significant Investment Category (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 2,472,787	$ 3,040,696
Short term investments Gross Unrealized Losses	(7,950)	(16,907)
Short term investments	18,817,655	21,287,064
Cash and cash equivalents and Short term investments, Amortized Cost	32,084,962	36,330,039
Cash and cash equivalents and Short term investments, Estimated Fair Value	32,077,012	36,313,132
Cash and cash equivalents	13,259,357	15,026,068	$ 36,582,992	$ 45,161,403
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Losses	(2,297)	(5,540)
Cash equivalents and Short term investments, Estimated Fair Value	7,265,247	10,720,010
Cash equivalents and Short term investments, Amortized Cost	7,267,544	10,725,550
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	6,019,931	3,750,621
Short term investments Gross Unrealized Losses	(5,653)	(11,367)
Short term investments	16,319,047	18,801,805
Cash equivalents and Short term investments, Estimated Fair Value	22,338,978	22,552,426
Cash equivalents and Short term investments, Amortized Cost	22,344,631	22,563,793
Money Market Funds \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	4,766,639	8,234,751
Repurchase Agreements \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	3,000,329	3,000,233
US Treasury Securities \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	2,500,905	2,490,799
Short term investments Gross Unrealized Losses	(2,297)	(5,540)
Short term investments	2,498,608	2,485,259
Commercial Paper \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	2,246,170
Short Term Investments Amortized Cost	9,701,381	9,716,093
Short term investments	7,455,211	9,716,093
Cash equivalents and Short term investments, Estimated Fair Value	9,701,381
Corporate Debt Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	773,432
Short Term Investments Amortized Cost	5,323,767	6,829,191
Short term investments Gross Unrealized Losses	(2,059)	(9,414)
Short term investments	5,321,708	6,819,777
Asset-backed Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		750,388
Short Term Investments Amortized Cost	4,319,154	3,018,276
Short term investments Gross Unrealized Losses	(3,594)	(1,953)
Short term investments	4,315,560	2,265,935
Cash equivalents and Short term investments, Estimated Fair Value	$ 4,315,560	$ 3,016,323