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ORDINARY SHARE AND SHARE INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2022
Summary of the Assumptions Used in the Estimating the Fair Values of Stock-based Payment Awards Excluding Non-employee |
|  | Years ended December 31, |
Stock Options: |  | 2022 |  |  | 2016 |
Expected term in years |  |  | 4.25 |  |  |  | 4.75 |
Weighted average risk-free interest rate |  |  | 1.02 | % |  |  | 1.30 | %
Expected dividend rate |  |  | — | % |  |  | — | %
Volatility |  |  | 55.21 | % |  |  | 51.6 | %
Summary of Stock-based Compensation Expense Recognized in Consolidated Statements of Comprehensive Loss |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Cost of net sales |  | $ | 97 |  |  | $ | 87 |  |  | $ | 89 |
Selling, general and administrative |  |  | 258 |  |  |  | 236 |  |  |  | 360 |
Research and development |  |  | 248 |  |  |  | 181 |  |  |  | 254 |
Total |  | $ | 603 |  |  | $ | 504 |  |  | $ | 703 |
2017 Equity Incentive Plan |
Summary of Stock Options Activity |
|  |  |  |  | Weighted |
|  | Number of |  |  | average |
|  | shares |  |  | exercise |
|  | outstanding |  |  | price |
|  | (in thousands) |  |  |  |
Options Outstanding, December 31, 2020 |  |  | 264 |  |  | $ | 5.32 |
Options granted |  |  | 213 |  |  |  | 4.28 |
Options exercised |  |  | — |  |  |  | — |
Options forfeited or expired |  |  | (113 | ) |  |  | 6.08 |
Options Outstanding, December 31, 2021 |  |  | 364 |  |  | $ | 4.47 |
Options granted |  |  | — |  |  |  | — |
Options exercised |  |  | (4 | ) |  |  | 4.52 |
Options forfeited or expired |  |  | (13 | ) |  |  | 6.59 |
Options Outstanding, December 31, 2022 |  |  | 347 |  |  | $ | 4.39 |
Summary of Unvested Restricted Awards |
|  |  |  |  | Weighted |
|  |  |  |  | average |
|  |  |  |  | grant date |
|  | Shares |  |  | fair value |
|  | (in thousands) |  |  |  |
Total nonvested restricted stock at December 31, 2020 |  |  | 105 |  |  | $ | 12.20 |
Granted |  |  | 24 |  |  |  | 5.16 |
Vested |  |  | (49 | ) |  |  | 10.84 |
Forfeited |  |  | (21 | ) |  |  | 14.84 |
Total nonvested restricted stock at December 31, 2021 |  |  | 59 |  |  | $ | 9.56 |
Granted |  |  | 29 |  |  |  | 3.97 |
Vested |  |  | (44 | ) |  |  | 9.66 |
Forfeited |  |  | (1 | ) |  |  | 14.82 |
Total nonvested restricted stock at December 31, 2022 |  |  | 43 |  |  | $ | 5.65 |
Summary of Significant Ranges of Outstanding and Exercisable Stock Options |
|  |  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Number of shares |  |  | Average |  |  | Weighted |  |  | Number of shares |  |  | Weighted |
Range of |  |  | Outstanding |  |  | Remaining |  |  | Average |  |  | Exercisable |  |  | Average |
Exercise Prices |  |  | as of 12/31/2022 |  |  | Contractual Term |  |  | Exercise Price |  |  | as of 12/31/2022 |  |  | Exercise Price |
$ | 4.28 |  |  | $ | 4.28 |  |  |  | 205,969 |  |  | 5.92 |  |  | $ | 4.28 |  |  |  | 102,659 |  |  | $ | 4.28 |
$ | 4.56 |  |  | $ | 4.56 |  |  |  | 140,714 |  |  |  | 4.90 |  |  | $ | 4.56 |  |  |  | 140,714 |  |  | $ | 4.56 |
|  | Number of shares |  |  | Weighted average exercise price |
Options exercisable as of December 31, 2022 |  |  | 243,373 |  |  | $ | 4.44 |
Options vested and expected to vest as of December 31, 2022 |  |  | 346,683 |  |  | $ | 4.39 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&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 (e) -URI https://asc.fasb.org/extlink&oid=128089324&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 (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 https://asc.fasb.org/extlink&oid=128089324&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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