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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The components of basic and diluted net loss per share were as follows (in thousands, except loss per share data): Schedule of Earnings Per Share, Basic and Diluted
|  |  | Year Ended December 31,
|  |  | 2021 |  |  | 2020 |  |  | 2019
Numerator: |  |  |  |  |  |  |  |  |
Net loss available for common shareholders |  | $ | (43,200) |  | $ | (13,634) |  | $ | (26,483)
Denominator: |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 160,662 |  |  | 139,829 |  |  | 111,297
Net loss per share - basic and diluted |  | $ | (0.27) |  | $ | (0.10) |  | $ | (0.24)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | During each of the years ended December 31, 2021, 2020 and 2019, we excluded the following securities from net loss per share as the effect of including them would have been anti-dilutive. The shares shown represent the number of shares of common stock which would be issued upon conversion in the respective years shown below (in thousands): Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
|  |  | Year Ended December 31,
|  |  | 2021 |  |  | 2020 |  |  | 2019
Options outstanding |  |  | 1,533 |  |  | 3,281 |  |  | 5,104
Nonvested restricted stock units |  |  | 2,625 |  |  | 1,982 |  |  | 1,215
|  |  | 4,158 |  |  | 5,263 |  |  | 6,319
Expensed Share-based Payments | The following table summarizes the amount of share-based compensation expense by line item on the Statement of Operations (in thousands): Expensed Share-based Payments
|  |  | Year Ended December 31,
|  |  | 2021 |  |  | 2020 |  |  | 2019
Cost of product revenue |  | $ | - |  | $ | - |  | $ | 26
Research and development expense |  |  | 6,125 |  |  | 699 |  |  | 379
Sales, marketing, general and administrative expense |  |  | 9,159 |  |  | 598 |  |  | 1,209
|  | $ | 15,284 |  | $ | 1,297 |  | $ | 1,614

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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