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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2020
STOCK-BASED COMPENSATION |
Summary of the Company's stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | 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
​
Schedule or Description of Weighted Average Discount Rate | ​
​ | ​ | ​ | ​ | ​
​ |  | 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 | %
​
Schedule of stock-based compensation expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Six Months Ended
​ |  | June 30, |  | June 30,
​ | ​ | 2020 |  | 2019 | ​ | 2020 |  | 2019
Stock Compensation expenses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Research and development | ​ | $ | 528,000 | ​ | $ | 593,000 | ​ | $ | 1,309,000 | ​ | $ | 1,280,000
General and administrative | ​ |  | 833,000 | ​ |  | 770,000 | ​ |  | 1,396,000 | ​ |  | 1,609,000
Total stock compensation expenses | ​ | $ | 1,361,000 | ​ | $ | 1,363,000 | ​ | $ | 2,705,000 | ​ | $ | 2,889,000

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- Definition 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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