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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Options Granted, Exercised, Expired and Forfeited | A summary of stock options expired and forfeited under our plans and options outstanding as of, and changes made during, the three months ended March 31, 2021 and the year ended December 31, 2020 is presented below:
| Outstanding and Exercisable |  |
| Number of Options |  | Weighted Average Exercise Price |  |  |  |
Options outstanding and exercisable, December 31, 2019 | 215,345 |  |  | $ | 12.27 |  |  |  |  |
Expired | (107,845) |  |  | 4.92 |  |  |  |
Forfeited | — |  |  | — |  |  |  |
Options outstanding and exercisable, December 31, 2020 | 107,500 |  |  | 19.64 |  |  |  |  |
Options outstanding and exercisable, March 31, 2021 | 107,500 |  |  | $ | 19.64 |  |  |  |  |
Shares Outstanding and Exercisable, By Exercise Price Range | Additional information as of March 31, 2021 is as follows:
|  | Outstanding and Exercisable
Range of price |  | Number of Options |  | Weighted Average Remaining Contractual Life (In Years) |  | Weighted Average Exercise Price
$0.00 – $10.00 |  | 2,500 |  |  | 2.20 |  | $ | 9.00 |
$10.01 – $20.00 |  | 97,500 |  |  | 1.81 |  | 19.32 |
$20.01 – $30.00 |  | 2,500 |  |  | 1.19 |  | 21.80 |
$30.01 – $40.00 |  | 5,000 |  |  | 0.96 |  | 30.20 |
|  | 107,500 |  |  | 1.76 |  | $ | 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 March 31,
| 2021 |  | 2020
Research and development | $ | 17 |  |  | $ | 47 |
Sales, general and administrative | $ | 16 |  |  | $ | 111 |
| $ | 33 |  |  | $ | 158 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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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