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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity Related to Stock Options |
| Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value
Outstanding, January 1, 2021 |  | 3,815,585 |  |  | $ | 5.56 |  |  |  | 8.9 |  | $ | 342,551
Granted |  | 1,345,136 |  |  |  | 1.97 |  |  |  |  |  |  | 21,600
Exercised |  | — |  |  |  | — |  |  |  |  |  |  | —
Cancelled |  | (29,458 | ) |  |  | 5.22 |  |  |  |  |  |  | *
Outstanding, September 30, 2021 |  | 5,131,263 |  |  | $ | 4.62 |  |  |  | 8.2 |  | $ | 73,800
Exercisable, September 30, 2021 |  | 1,988,192 |  |  | $ | 7.67 |  |  |  | 7.6 |  | $ | 36,000
Summary of Activity Related to Restricted Stock Awards Granted |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |
Nonvested, January 1, 2021 |  |  | 25,645 |  |  | $ | 10.07 |  |
Granted |  |  | 165,413 |  |  |  | 2.41 |  |
Vested |  |  | (149,894 | ) |  |  | 2.82 |  |
Cancelled |  |  | (5,687 | ) |  |  | 6.38 |  |
Nonvested, September 30, 2021 |  |  | 35,477 |  |  | $ | 2.82 |  |
Summary of Activity Related to Restricted Stock and Deferred Stock Units Granted |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested, January 1, 2021 |  |  | 1,014,123 |  |  | $ | 1.50 |
Granted |  |  | 438,316 |  |  |  | 2.07 |
Vested |  |  | (329,198 | ) |  |  | 1.67 |
Cancelled |  |  | (5,354 | ) |  |  | 1.97 |
Nonvested, September 30, 2021 |  |  | 1,117,887 |  |  | $ | 1.67 |
Schedule of Recognized Stock Compensation for Equity Awards |
|  |  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Selling, general and administrative |  | $ | 658,314 |  |  | $ | 541,757 |  |  | $ | 2,171,122 |  |  | $ | 1,789,122 |
Research and development |  |  | 87,222 |  |  |  | 179,664 |  |  |  | 314,710 |  |  |  | 649,485 |
Cost of goods sold |  |  | 14,901 |  |  |  | 21,507 |  |  |  | 54,761 |  |  |  | 51,944 |
Total expense |  | $ | 760,437 |  |  | $ | 742,928 |  |  | $ | 2,540,593 |  |  | $ | 2,490,551 |
Summary of Weighted Average Assumptions Used in Valuing Plans |
| Nine months ended September 30, |
| 2021 |  |  | 2020 |
Fair value at grant date | $ | 1.33 |  | $ | 0.98 |
Expected volatility | 80.2 | % |  | 142.1 | %
Risk-free interest rate | 0.7 | % |  | 0.7 | %
Expected holding period, in years | 6.0 |  |  | 6.1 |
Dividend yield |  | — | % |  | — | %

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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=122041274&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 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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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