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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Stock Based Compensation |
Summary of Activity Related to Stock Options |
| Number of Options (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |
Outstanding, January 1, 2023 | $ | 440 |  |  | $ | 55.65 |  |  |  | 7.5 |
Granted |  | 3 |  |  |  |  |  |  |  |  |
Exercised |  | — |  |  |  |  |  |  |  |  |
Cancelled |  | (108 | ) |  |  |  |  |  |  |  |
Outstanding, June 30, 2023 | $ | 335 |  |  | $ | 58.79 |  |  |  | 7.0 |
Exercisable, June 30, 2023 | $ | 236 |  |  | $ | 76.92 |  |  |  | 6.6 |
Summary of Activity Related to Restricted Stock and Deferred Stock Units Granted |
|  | Number of Shares (in thousands) |  |  | Weighted Average Grant Date Fair Value |
Nonvested, January 1, 2023 |  |  | 127 |  |  | $ | 11.85 |
Granted |  |  | — |  |  |  |  |
Vested |  |  | (11 | ) |  |  |  |
Cancelled |  |  | — |  |  |  |  |
Nonvested, June 30, 2023 |  |  | 116 |  |  | $ | 11.06 |
Schedule of Recognized Stock Compensation for Equity Awards |
| Three months ended June 30, |  |  | Six months ended June 30, |
(in thousands) | 2023 |  |  | 2022 |  | 2023 |  |  | 2022 |
Selling, general and administrative | $ | 115 |  |  | $ | 676 |  | $ | 625 |  |  | $ | 1,381 |
Research and development |  | 61 |  |  |  | 68 |  |  | 118 |  |  |  | 134 |
Cost of goods sold |  | 7 |  |  |  | 8 |  |  | 12 |  |  |  | 14 |
Total expense | $ | 183 |  |  | $ | 752 |  | $ | 755 |  |  | $ | 1,529 |
Summary of Weighted Average Assumptions Used in Valuing Plans |
| Six months ended June 30, |
| 2023 |  |  |  | 2022 |
Fair value at grant date | $ | 3.46 |  |  | $ | 7.95 |
Expected volatility | 114.0 | % |  |  | 84.0 | %
Risk-free interest rate | 3.9 | % |  |  | 1.7 | %
Expected holding period, in years | 6.0 |  |  |  | 6.0 |
Dividend yield |  | — | % |  |  | — | %

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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