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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Valuation Assumptions | The fair value of each stock option granted was estimated using the following weighted average assumptions:
| Six Months Ended June 30, 2021
Risk free interest rate | 0.47%
Expected maturity | 3 years
Expected volatility | 1.36
Expected dividend yields | —
Weighted average grant date market value per share | $3.25
Summary of Options Granted, Exercised, Expired and Forfeited | A summary of stock options activity during the six months ended June 30, 2021 and the year ended December 31, 2020 is presented below:
| Outstanding |  | Exercisable
| Number of Options |  | Weighted Average Exercise Price |  | Number of Options |  | Weighted Average Exercise Price
Options outstanding, December 31, 2019 | 215,345 |  |  | $ | 12.27 |  |  | 215,345 |  |  | $ | 12.27 |
Expired | (107,845) |  |  | 4.92 |  | — |  |  | — |
Options outstanding, December 31, 2020 | 107,500 |  |  | $ | 19.64 |  |  | 107,500 |  |  | $ | 19.64 |
Granted | 300,000 |  |  | 3.25 |  |  | — |  |  | — |
Options outstanding, June 30, 2021 | 407,500 |  |  | $ | 7.57 |  |  | 107,500 |  |  | $ | 19.64 |
Shares Outstanding and Exercisable, By Exercise Price Range | Additional information as of June 30, 2021 is as follows:
|  | Outstanding |  | Exercisable
Range of price |  | Number of Options |  | Weighted Average Remaining Contractual Life (In Years) |  | Weighted Average Exercise Price |  | Number of Options |  | Weighted Average Exercise Price
$0.00 – $10.00 |  | 302,500 |  |  | 9.93 |  | $ | 3.30 |  |  | 2,500 |  |  | $ | 9.00 |
$10.01 – $20.00 |  | 97,500 |  |  | 1.56 |  | 19.32 |  |  | 97,500 |  |  | 19.32 |
$20.01 – $30.00 |  | 2,500 |  |  | 0.94 |  | 21.80 |  |  | 2,500 |  |  | 21.80 |
$30.01 – $40.00 |  | 5,000 |  |  | 0.70 |  | 30.20 |  |  | 5,000 |  |  | 30.20 |
|  | 407,500 |  |  | 7.76 |  | $ | 7.57 |  |  | 107,500 |  |  | $ | 19.64 |
Schedule of Compensation Expense | Stock-based compensation expense relating to Restricted Series D Preferred Stock is allocated as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | $ | — |  |  | $ | 14 |  |  | $ | 17 |  |  | $ | 28 |
Sales, general and administrative | $ | — |  |  | $ | 15 |  |  | $ | 16 |  |  | $ | 27 |
| $ | — |  |  | $ | 29 |  |  | $ | 33 |  |  | $ | 55 |

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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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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