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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock-Based Compensation |
Summary of stock-based compensation expense | The following table summarizes stock-based compensation expense (in thousands), which is included in operating or general and administrative expense, as appropriate, in the Consolidated Statements of Operations and Comprehensive Loss for the years ended December 31, 2020 and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2020 | ​ | 2019 | ​
Restricted stock awards | ​ | $ | — | ​ | $ | 15 | ​
Restricted stock unit awards | ​ |  | 703 | ​ |  | 893 | ​
Common stock awards | ​ | ​ | — | ​ | ​ | 297 | ​
Total compensation expense | ​ | $ | 703 | ​ | $ | 1,205 | ​
Summary of the Company's nonvested restricted stock unit awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of Restricted Stock Unit Awards | ​ | Weighted Average Grant Date Fair Value | ​
Nonvested as of December 31, 2019 | ​ | ​ | 410,100 | ​ | $ | 5.55 | ​
Granted | ​ |  | — | ​ | $ | — | ​
Vested | ​ |  | (236,100) | ​ | $ | 4.41 | ​
Forfeited | ​ | ​ | — | ​ | $ | — | ​
Nonvested as of December 31, 2020 | ​ | ​ | 174,000 | ​ | $ | 7.10 | ​
Summary of common shares with immediate vesting granted to outside directors and employees | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of Common Stock Awards |  | Weighted Average Grant Date Fair Value |
Year ended December 31, 2020 | ​ | ​ | — | ​ | $ | — | ​
Year ended December 31, 2019 | ​ | ​ | 119,556 | ​ | $ | 2.48 | ​

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to employees and outside directors that were outstanding at the beginning and end of the year. + References No definition available. + Details
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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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