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Share-Based Compensation - Schedule of Estimated Values of Stock Option Grants Valuation Assumptions (Details)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
April 30, 2015 Grant [Member]
Risk-free interest rate	1.43%	1.43%
Weighted average expected term	5 years	5 years
Expected volatility	143.10%	143.10%
Expected dividend yield	0.00%	0.00%
January 1 , 2016 Grant [Member]
Risk-free interest rate	1.76%	1.76%
Weighted average expected term	5 years	5 years
Expected volatility	134.18%	134.18%
Expected dividend yield	0.00%	0.00%
February 10 , 2016 Grant [Member]
Risk-free interest rate	1.15%	1.15%
Weighted average expected term	5 years	5 years
Expected volatility	132.97%	132.97%
Expected dividend yield	0.00%	0.00%
December 6 , 2016 Grant [Member]
Risk-free interest rate	1.84%	1.84%
Weighted average expected term	5 years	5 years
Expected volatility	123.82%	123.82%
Expected dividend yield	0.00%	0.00%
March 15, 2017 Grant [Member]
Risk-free interest rate	2.14%	2.14%
Weighted average expected term	5 years	5 years
Expected volatility	121.19%	121.19%
Expected dividend yield	0.00%	0.00%
September 25, 2017 Grant [Member]
Risk-free interest rate	1.85%	1.85%
Weighted average expected term	5 years	5 years
Expected volatility	130.79%	130.79%
Expected dividend yield	0.00%	0.00%
January 30 , 2019 Grant [Member]
Risk-free interest rate	2.54%	2.54%
Weighted average expected term	5 years	5 years
Expected volatility	115.80%	115.80%
Expected dividend yield	0.00%	0.00%
March 11 , 2019 Grant [Member]
Risk-free interest rate	2.44%	2.44%
Weighted average expected term	5 years	5 years
Expected volatility	116.46%	116.46%
Expected dividend yield	0.00%	0.00%

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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