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Marketable Securities (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	$ 15,610,105	$ 4,672,476
U.S. Treasury notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	6,486,345	0
U.S. Agency issued mortgage-backed securities – variable rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	1,569,884	3,539,102
U.S. Agency notes and bonds – fixed rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities		198,293
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	2,502,977	0
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	548,641	935,081
Short-term cash investments
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	4,502,258
Level 1
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	6,486,345
Level 1 | U.S. Treasury notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	6,486,345	0
Level 1 | U.S. Agency issued mortgage-backed securities – variable rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0	0
Level 1 | U.S. Agency notes and bonds – fixed rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0	0
Level 1 | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0	0
Level 1 |
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0	0
Level 1 | Short-term cash investments
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0
Level 2
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	9,123,760	4,672,476
Level 2 | U.S. Treasury notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	0	0
Level 2 | U.S. Agency issued mortgage-backed securities – variable rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	1,569,884	3,539,102
Level 2 | U.S. Agency notes and bonds – fixed rate
Schedule of Available-for-sale Securities [Line Items]
Marketable securities		198,293
Level 2 | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	2,502,977	0
Level 2 |
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	548,641	935,081
Level 2 | Short-term cash investments
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	$ 4,502,258	$ 0

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+ References

No definition available.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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