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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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 gain 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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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 ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 3,979,962	$ 3,043,800
Short term investments Gross Unrealized Gains	3,917	250
Short term investments Gross Unrealized Losses	(505)	(9,796)
Short term investments	21,137,627	20,168,981
Cash and cash equivalents and Short term investments, Amortized Cost	32,881,635	33,799,183
Cash and cash equivalents and Short term investments, Estimated Fair Value	32,885,047	33,789,637
Cash and cash equivalents	11,747,420	13,620,656	$ 15,462,507	$ 15,026,068
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Gains	1,209
Short term investments Gross Unrealized Losses		(164)
Cash equivalents and Short term investments, Estimated Fair Value	9,744,503	7,469,277
Cash equivalents and Short term investments, Amortized Cost	9,743,294	7,469,441
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Gains	2,708	250
Short term investments Gross Unrealized Losses	(505)	(9,632)
Short term investments	16,159,952	18,181,351
Cash equivalents and Short term investments, Estimated Fair Value	19,160,582	23,276,560
Cash and cash equivalents	3,000,630	5,095,209
Cash equivalents and Short term investments, Amortized Cost	19,158,379	23,285,942
Money Market Funds \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	4,766,828	5,481,647
Repurchase Agreements \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	3,000,630	3,000,226
US Treasury Securities \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	4,976,466	1,987,794
Short term investments Gross Unrealized Gains	1,209
Short term investments Gross Unrealized Losses		(164)
Short term investments	4,977,675	1,987,630
Commercial Paper \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		2,094,983
Short Term Investments Amortized Cost	8,065,664	10,639,390
Short term investments	8,065,664	8,544,407
Cash equivalents and Short term investments, Estimated Fair Value	8,065,664	10,639,390
Corporate Debt Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	3,701,311	5,963,913
Short term investments Gross Unrealized Gains	616
Short term investments Gross Unrealized Losses	(143)	(6,678)
Short term investments	3,701,784	5,957,235
Asset-backed Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	4,390,774	3,682,413
Short term investments Gross Unrealized Gains	2,092	250
Short term investments Gross Unrealized Losses	(362)	(2,954)
Short term investments	4,392,504	3,679,709
Cash equivalents and Short term investments, Estimated Fair Value	$ 4,392,504	$ 3,679,709