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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Options Outstanding | Activity in the various Plans during the nine months ended September 30, 2019 is reflected in the following table:
Options |  | Number of Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2019 |  |  | 434,012 |  |  | $ | 4.62 |
Granted |  |  | 180,000 |  |  |  | 3.01 |
Exercised |  |  | — |  |  |  | — |
Forfeited |  |  | (24,887 | ) |  |  | (13.78 | )
Outstanding at September 30, 2019 |  |  | 589,125 |  |  | $ | 3.74 |
Exercisable at September 30, 2019 |  |  | 454,125 |  |  | $ | 3.96 |
Schedule of Fair Value of Stock Options Assumption | The Company has utilized the following assumptions in its Black-Scholes option valuation model to calculate the estimated grant date fair value of the options during the nine months ended September 30, 2019.
|  | Assumptions |
Volatility – range |  |  | 107.6 | %
Risk-free rate |  |  | 2.23 | %
Expected term |  |  | 5.5 years |
Exercise price |  | $ | 3.01 |
Shares Authorized Under Stock Option Plans by Exercise Price Range | The following table summarizes the range of exercise prices and weighted average remaining contractual life for outstanding and exercisable options under the Company’s option plans as of September 30, 2019:
|  |  | Outstanding options |  | Exercisable options |
Exercise price range |  |  | Number of options |  |  | Weighted average remaining contractual life |  | Number of options |  |  | Weighted average remaining contractual life |
$ | 0.01 to $3.49 |  |  |  | 470,313 |  |  | 8.6 years |  |  | 335,313 |  |  |  | 8.2 years |
$ | 3.50 to $4.99 |  |  |  | 66,875 |  |  | 4.5 years |  |  | 66,875 |  |  |  | 4.5 years |
$ | 5.00 to $6.49 |  |  |  | — |  |  | — years |  |  | — |  |  |  | — years |
$ | 6.50 to $7.99 |  |  |  | 8,437 |  |  | 2.1 years |  |  | 8,437 |  |  |  | 2.1 years |
$ | 8.00 to $9.99 |  |  |  | 2,500 |  |  | 1.7 years |  |  | 2,500 |  |  |  | 1.7 years |
$ | 10.00 to $19.99 |  |  |  | 39,750 |  |  | 1.3 years |  |  | 39,750 |  |  |  | 1.3 years |
$ | 20.00 to $24.99 |  |  |  | 1,250 |  |  | 0.3 years |  |  | 1,250 |  |  |  | 0.3 years |
|  |  |  |  | 589,125 |  |  | 7.5 years |  |  | 454,125 |  |  |  | 6.9 years |
Summary of Restricted Stock Activity | A summary of all restricted stock activity under the equity compensation plans for the nine months ended September 30, 2019 is as follows:
|  | Number of Restricted shares |  |  | Weighted average grant date fair value |
Non-vested balance, January 1, 2019 |  |  | 772,150 |  |  | $ | 3.40 |
Granted |  |  | 522,110 |  |  |  | 2.91 |
Vested |  |  | (397,790 | ) |  |  | (3.84 | )
Forfeited |  |  | (5,370 | ) |  |  | (3.46 | )
Non-vested balance, September 30, 2019 |  |  | 891,100 |  |  | $ | 2.91 |
Schedule of Non-vested Balance of Restricted Stock | The non-vested balance of restricted stock vests as follows:
Years ended |  | Number of shares |
2019 (October 1, 2019 to December 31, 2019) |  |  | 376,225 |
2020 |  |  | 264,750 |
2021 |  |  | 250,125 |

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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 http://asc.fasb.org/extlink&oid=116856206&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 http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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 http://asc.fasb.org/extlink&oid=116856206&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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