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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2020

STOCK-BASED COMPENSATION

Summary of the Company's stock option activity

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​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		​	​		Weighted
​	​	​	​	​	​	​	​	​	​	Average
​	​	​	​	Weighted		​	​	​	​	Remaining
​	​	Number of	​	Average		​	Total Intrinsic		​	Contractual
​	​	Shares	​	Exercise Price		​	Value		​	Life (in years)
Outstanding as of January 1, 2020		4,983,000	​	$	7.79	​	$	18,000		8.9
Granted		1,371,000	​		2.13	​		—		9.7
Cancelled		(512,500)	​		9.13	​		—		—
Outstanding as of June 30, 2020		5,841,814	​	$	6.34	​	$	14,000		8.7
Options vested and exercisable		1,793,460	​	$	7.70	​	$	—		8.3

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Schedule or Description of Weighted Average Discount Rate

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​	​	​	​	​
​		For the Six Months Ended
​	​	June 30, 2020		​
Exercise price	​	$	2.13	​
Expected term (years)	​		6.0	​
Expected stock price volatility	​		109	%
Risk-free rate of interest	​		1	%
Expected dividend rate	​		0	%

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Schedule of stock-based compensation expenses

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For the Three Months Ended

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For the Six Months Ended

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June 30,

June 30,

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2020

2019

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2020

2019

Stock Compensation expenses:

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Research and development

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$

528,000

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$

593,000

​

$

1,309,000

​

$

1,280,000

General and administrative

​

833,000

​

770,000

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1,396,000

​

1,609,000

Total stock compensation expenses

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$

1,361,000

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$

1,363,000

​

$

2,705,000

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$

2,889,000

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Tabular disclosure of stock based compensation expenses recorded.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

+ 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
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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