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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of stock option activity | The following table summarizes stock option activities for the six months ended June 30, 2019:
|  |  |  |  |  | Weighted Average
|  |  |  |  |  | Remaining
|  |  |  | Weighted Average |  | Contractual Life
|  | Stock Options |  | Exercise Price |  | (in years)
Outstanding at December 31, 2018 |  | 1,241,675 |  | $ | 5.73 |  | 8.31
Options granted |  | — |  |  | — |  | —
Outstanding at June 30, 2019 |  | 1,241,675 |  |  | 5.73 |  | 7.81
Options vested and exercisable at June 30, 2019 |  | 310,417 |  | $ | 5.73 |  | 7.81
Summary of Stock based compensation expenses | The following table summarizes stock-based compensation expense for the three and six months ended June 30, 2019 and 2018 (in thousands).
|  | For the three months ended June 30, |  | For the six months ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
General and administrative |  | $ | 333 |  | $ | 393 |  | $ | 669 |  | $ | 936
Research and development |  |  | 289 |  |  | 578 |  |  | 385 |  |  | 2,030
Total stock-based compensation expense |  | $ | 622 |  | $ | 971 |  | $ | 1,054 |  | $ | 2,966
Summary of warrant activities | A summary of warrant activities for six months ended June 30, 2019 is presented below:
|  |  |  |  |  |  | Weighted Average
|  |  |  |  |  |  | Remaining
|  |  |  | Weighted Average |  | Contractual Life
|  | Warrants |  | Exercise Price |  | (in years)
Outstanding as of December 31, 2018 |  | 5,210,698 |  | $ | 8.32 |  | 3.10
Granted |  | 288,184 |  |  | 3.47 |  | 9.75
Exercised |  | (65,358) |  |  | — |  | —
Outstanding as of June 30, 2019 |  | 5,433,524 |  | $ | 8.16 |  | 2.92
Restricted Stock [Member] |
Summary of restricted stock activities | The following table summarizes restricted stock award activities for the six months ended June 30, 2019:
|  |  |  | Weighted Average
|  | Number |  | Grant Date
|  | of Shares |  | Fair Value
Nonvested at December 31, 2018 |  | 502,636 |  | $ | 5.76
Granted |  | 50,000 |  |  | 3.80
Nonvested at June 30, 2019 |  | 552,636 |  | $ | 5.58
Restricted Stock Units (RSUs) |
Summary of restricted stock activities | The following table summarizes restricted stock units activities for the six months ended June 30, 2019:
|  |  |  |  | Weighted Average
|  | Number |  | Grant Date
|  | of Units |  | Fair Value
Nonvested at December 31, 2018 |  |  | 1,032,084 |  | $ | 7.77
Granted |  |  | 309,000 |  |  | 2.99
Forfeited |  |  | (296,750) |  |  | 7.98
Vested |  |  | (76,000) |  |  | 10.81
Nonvested at June 30, 2019 |  |  | 968,334 |  | $ | 5.94

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for share-based compensation 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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