Cash and cash equivalents and short-term investments.

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

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

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- Definition

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

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No definition available.

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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-Publisher FASB
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-Publisher FASB
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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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, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 3,692,893	$ 3,040,696
Short term investments Gross Unrealized Losses	(21,043)	(16,907)
Short term investments	17,515,408	21,287,064
Cash and cash equivalents and Short term investments, Amortized Cost	32,998,958	36,330,039
Cash and cash equivalents and Short term investments, Estimated Fair Value	32,977,915	36,313,132
Cash and cash equivalents	15,462,507	15,026,068	$ 41,859,298	$ 45,161,403
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Losses	(5,660)	(5,540)
Cash equivalents and Short term investments, Estimated Fair Value	7,518,304	10,720,010
Cash equivalents and Short term investments, Amortized Cost	7,523,964	10,725,550
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	6,738,314	3,750,621
Short term investments Gross Unrealized Losses	(15,383)	(11,367)
Short term investments	15,028,404	18,801,805
Cash equivalents and Short term investments, Estimated Fair Value	21,766,718	22,552,426
Cash equivalents and Short term investments, Amortized Cost	21,782,101	22,563,793
Money Market Funds \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	5,031,300	8,234,751
Repurchase Agreements \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	3,000,450	3,000,233
US Treasury Securities \| Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	2,492,664	2,490,799
Short term investments Gross Unrealized Losses	(5,660)	(5,540)
Short term investments	2,487,004	2,485,259
Commercial Paper \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	2,987,944
Short Term Investments Amortized Cost	10,460,305	9,716,093
Short term investments	7,472,361	9,716,093
Cash equivalents and Short term investments, Estimated Fair Value	10,460,305
Corporate Debt Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	4,551,681	6,829,191
Short term investments Gross Unrealized Losses	(9,610)	(9,414)
Short term investments	4,542,071	6,819,777
Asset-backed Securities \| Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	749,920	750,388
Short Term Investments Amortized Cost	3,769,665	3,018,276
Short term investments Gross Unrealized Losses	(5,773)	(1,953)
Short term investments	3,013,972	2,265,935
Cash equivalents and Short term investments, Estimated Fair Value	$ 3,763,892	$ 3,016,323