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Quarterly Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2022
Quarterly Results (unaudited) |
Schedule of quarterly results | Quarterly results for the years ended December 31, 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands, except per share data) | ​ | First | ​ | Second | ​ | Third | ​ | Fourth
For the year ended December 31, 2022 |  | Quarter |  | Quarter |  | Quarter |  | Quarter
Revenue | ​ | $ | — | ​ | $ | — | ​ | $ | 324 | ​ | $ | 50
Gross Profit (Loss) | ​ | $ | — | ​ | $ | — | ​ | $ | 123 | ​ | $ | (7)
Operating Expense | ​ | $ | 1,517 | ​ | $ | 1,660 | ​ | $ | 1,558 | ​ | $ | 1,498
Net loss attributed to common stockholders | ​ | $ | (1,490) | ​ | $ | (1,638) | ​ | $ | (1,312) | ​ | $ | (1,318)
Net Loss per share - basic and fully diluted | ​ | $ | (0.05) | ​ | $ | (0.05) | ​ | $ | (0.03) | ​ | $ | (0.03)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the year ended December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Revenue | ​ | $ | 363 | ​ | $ | — | ​ | $ | 190 | ​ | $ | 54
Gross Profit (Loss) | ​ | $ | 138 | ​ | $ | (505) | ​ | $ | (88) | ​ | $ | 3
Operating Expense | ​ | $ | 2,159 | ​ | $ | 2,037 | ​ | $ | 2,269 | ​ | $ | 1,228
Net loss attributed to common stockholders | ​ | $ | (2,021) | ​ | $ | (2,290) | ​ | $ | (2,353) | ​ | $ | (1,227)
Net Loss per share - basic and fully diluted | ​ | $ | (0.07) | ​ | $ | (0.07) | ​ | $ | (0.07) | ​ | $ | (0.04)

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126900988&loc=d3e1280-108306 + Details
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