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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2023
Summary of information about stock options under the Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Shares | ​ | Price | ​ | Life (Years) | ​ | Value
​ | ​ | (in thousands, except per share and year data)
Balance at December 31, 2020 |  | 701 | ​ | $ | 15.51 |  | 4.2 | ​ | $ | 53
Granted |  | 95 | ​ | ​ | 12.21 | ​ | — | ​ | ​ | —
Exercised |  | — | ​ | ​ | — | ​ | — | ​ | ​ | 10
Forfeited | ​ | (159) | ​ | ​ | 14.56 | ​ | — | ​ | ​ | 2
Expired | ​ | (20) | ​ | ​ | 71.00 | ​ | — | ​ | ​ | —
Balance at December 31, 2021 |  | 617 | ​ | $ | 13.43 |  | 4.2 | ​ | $ | 53
Forfeited |  | (159) | ​ | ​ | 12.27 | ​ | — | ​ | ​ | 2
Expired |  | (10) | ​ | ​ | 27.80 | ​ | — | ​ | ​ | —
Balance at December 31, 2022 |  | 448 | ​ | $ | 13.43 |  | 2.6 | ​ | $ | —
Granted | ​ | 570 | ​ | ​ | 7.10 | ​ | — | ​ | ​ | —
Forfeited |  | (67) | ​ | ​ | 11.45 | ​ | — | ​ | ​ | 3
Balance at December 31, 2023 |  | 951 | ​ | $ | 9.78 |  | 3.0 | ​ | $ | 61
Exercisable at December 31, 2023 |  | 385 | ​ | $ | 13.53 |  | 1.5 | ​ | $ | —
Schedule of weighted-average assumptions used for estimation of the fair value of the options granted under the Plan at the date of grant, using the Black-Scholes Option Valuation Model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | 2023 |  | ​ | 2022 |  | ​ | 2021
Risk-free interest rate | ​ | ​ | 4.44% | ​ | ​ | — | ​ | ​ | 0.519% to 0.873%
Dividend yield | ​ | ​ | 0.00% | ​ | ​ | — | ​ | ​ | 0.00%
Volatility factor of the expected market price of common stock | ​ | ​ | 67% | ​ | ​ | — | ​ | ​ | 63%
Weighted-average expected life of option | ​ | ​ | 3 years | ​ | ​ | — | ​ | ​ | 3.5 years
Weighted-average grant date fair value | ​ | $ | 3.36 | ​ | $ | — | ​ | $ | 1.22
Summary of status and activity of non-vested stock options | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Number of | ​ | Fair Value
​ |  | Shares |  | Per Share
​ | ​ | (in thousands, except per share amounts)
Non-vested balance at December 31, 2022 | ​ | 126 | ​ | $ | 4.15
Granted | ​ | 570 | ​ | $ | 3.36
Cancelled/Forfeited | ​ | (28) | ​ | $ | 3.65
Vested | ​ | (102) | ​ | $ | 4.12
Non-vested balance at December 31, 2023 | ​ | 566 | ​ | $ | 3.39
Schedule of Restricted Stock Units | ​
​ | ​
​ | Number of
​ | Shares
​ | (in thousands)
Balance at December 31, 2020 | —
Granted | —
Vested and issued | —
Balance at December 31, 2021 | —
Granted | —
Vested and issued | —
Balance at December 31, 2022 | —
Granted | 109
Vested and issued | (80)
Balance at December 31, 2023 | 29
November 2019 Offering |
Schedule of Black-Scholes pricing model to determine the fair value of warrants | ​
​ | ​ | ​ | ​
​ | November 20, 2019
Risk-free interest rate | ​ | 1.55 | %
Dividend yield | ​ | 0.00 | %
Volatility factor of the expected market price of common stock | ​ | 60 | %
Weighted-average expected life | ​ | 5 years | ​
Weighted-average grant date fair value | $ | 0.52 | ​

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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