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)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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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 ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Cash	$ 3,040,696
Short term investments Gross Unrealized Losses	(16,907)
Short term investments	21,287,064
Cash and cash equivalents and Short term investments, Amortized Cost	36,330,039
Cash and cash equivalents and Short term investments, Estimated Fair Value	36,313,132
Cash and cash equivalents	15,026,068	$ 45,161,403	$ 5,335,913	$ 3,590,745
Level 1
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Short term investments Gross Unrealized Losses	(5,540)
Cash equivalents and Short term investments, Amortized Cost	10,725,550
Cash and cash equivalents and Short term investments, Estimated Fair Value	10,720,010
Level 2
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Short term investments Gross Unrealized Losses	(11,367)
Short term investments	18,801,805
Cash and cash equivalents	3,750,621
Cash equivalents and Short term investments, Amortized Cost	22,563,793
Cash and cash equivalents and Short term investments, Estimated Fair Value	22,552,426
Money Market Funds \| Level 1
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Cash equivalents	8,234,751
Repurchase Agreements \| Level 2
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Cash equivalents	3,000,233
US Treasury Securities \| Level 1
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Short Term Investments Amortized Cost	2,490,799
Short term investments Gross Unrealized Losses	(5,540)
Short term investments	2,485,259
Commercial Paper \| Level 2
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Short Term Investments Amortized Cost	9,716,093
Short term investments	9,716,093
Corporate Debt Securities \| Level 2
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Short Term Investments Amortized Cost	6,829,191
Short term investments Gross Unrealized Losses	(9,414)
Short term investments	6,819,777
Asset-backed Securities \| Level 2
Cash, Cash Equivalents and Short-Term Investments [Line Itmes]
Cash equivalents	750,388
Short Term Investments Amortized Cost	3,018,276
Short term investments Gross Unrealized Losses	(1,953)
Short term investments	$ 3,016,323