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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Stockholders' Equity Note [Abstract] |
Summary of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Contractual | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Life | ​ | Intrinsic
​ |  | Options |  | Price |  | (in Years) |  | Value
Outstanding at January 1, 2021 |  | 7,179,375 | ​ | $ | 3.14 |  | 4.93 | ​ | $ | —
Granted |  | 490,390 | ​ |  | 1.88 |  |  | ​ |  |
Canceled |  | (8,050) | ​ |  | 1.86 |  |  | ​ |  |
Exercised |  | (92,820) | ​ |  | 1.76 |  |  | ​ |  |
Expired/Forfeited |  | (1,721,070) | ​ |  | 5.63 |  |  | ​ |  |
Outstanding at June 30, 2021, and expected to vest |  | 5,847,825 | ​ | $ | 2.33 |  | 5.78 | ​ | $ | 2,792,000
Exercisable at June 30, 2021 |  | 1,963,658 | ​ | $ | 3.42 |  | 2.33 | ​ | $ | —
Summary of Stock Option Activity for Non-Vested Options | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ |  | Options |  | Fair Value
Balance at January 1, 2021 |  | 4,116,167 | ​ | $ | 0.08
Granted |  | 490,390 | ​ |  | 0.40
Vested |  | (647,390) | ​ | ​ | 0.43
Forfeited or Canceled |  | (75,000) | ​ |  | 0.08
Balance at June 30, 2021 |  | 3,884,167 | ​ | $ | 0.06
Summary of Warrant Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | ​ | ​
​ | ​ | ​ |  | Average |  | Contractual | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise |  | Life | ​ | Intrinsic
​ |  | Warrants |  | Price |  | (in Years) |  | Value
Outstanding and exercisable at January 1, 2021 |  | 579,815 | ​ | $ | 4.63 |  | 1.32 | ​ | $ | —
Granted |  | — | ​ |  | — |  | ​ | ​ |  |
Canceled |  | — | ​ |  | — |  | ​ | ​ |  |
Exercised |  | — | ​ |  | — |  | ​ | ​ |  |
Expired/Forfeited |  | — | ​ |  | — |  | ​ | ​ |  |
Outstanding and exercisable at June 30, 2021 |  | 579,815 | ​ | $ | 4.63 |  | 0.82 | ​ | $ | —
Summary of Restricted Stock Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ | ​ | Restricted | ​ | Grant Date
​ |  | Shares |  | Fair Value
Outstanding at January 1, 2021 |  | 780,833 | ​ | $ | 4.09
Granted |  | 245,224 | ​ |  | 1.65
Canceled |  | — | ​ |  | —
Vested |  | (195,224) | ​ |  | 1.58
Expired/Forfeited |  | — | ​ |  | —
Outstanding at June 30, 2021 |  | 830,833 | ​ | $ | 3.96

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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 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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&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 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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- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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