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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions [Table Text Block] | The fair value associated with the market award vesting was determined utilizing a binomial valuation methodology and the following assumptions:
|  | December 31, 2017
Risk-free interest rate |  | 1.81% - 2.38%
Exercise price |  | $5.73
Expected dividend yield |  | 0%
Expected term in years |  | 5.5 - 10.0
Expected volatility |  | 77.30% - 96.65%
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes stock option activities for the year ended December 31, 2018 and 2017:
|  | Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (in years) |
Outstanding at December 31, 2016 |  |  | - |  |  | $ | - |  |  |  | - |
Options granted |  |  | 1,241,675 |  |  |  | 5.73 |  |  |  | 9.31 |
Outstanding at December 31, 2017 |  |  | 1,241,675 |  |  |  | 5.73 |  |  |  | 9.31 |
Options granted |  |  | - |  |  |  | - |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 1,241,675 |  |  |  | 5.73 |  |  |  | 8.31 |
Options vested and exercisable at December 31, 2018 |  |  | 232,813 |  |  | $ | 5.73 |  |  |  | 8.31 |
Share-based Compensation, Activity [Table Text Block] | The following table summarizes stock-based compensation expense for the years ended December 31, 2018 and 2017 (in thousands).
|  | For the year ended December 31, |
|  | 2018 |  |  | 2017 |
Employee |  | $ | 3,664 |  |  | $ | 1,486 |
Non-employee |  |  | 1,296 |  |  |  | 526 |
Total stock-based compensation expense |  | $ | 4,960 |  |  | $ | 2,012 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | A summary of warrant activities for years ended December 31, 2018 and 2017 is presented below:
|  | Warrants |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (in years) |
Outstanding as of December 31, 2016 |  |  | 2,243,664 |  |  | $ | 7.98 |  |  |  | 5.16 |
Granted |  |  | 3,013,770 |  |  |  | 8.50 |  |  |  | 4.09 |
Exercised |  |  | (4,116 | ) |  |  | - |  |  |  | - |
Outstanding as of December 31, 2017 |  |  | 5,253,318 |  |  | $ | 8.28 |  |  |  | 3.89 |
Granted |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | (42,620 | ) |  |  | 4.25 |  |  |  | - |
Outstanding as of December 31, 2018 |  |  | 5,210,698 |  |  | $ | 8.32 |  |  |  | 3.10 |
Restricted Stock [Member] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock award activities for the year ended December 31, 2018 and 2017:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2016 |  |  | - |  |  | $ | - |
Granted |  |  | 180,000 |  |  |  | 5.73 |
Nonvested at December 31, 2017 |  |  | 180,000 |  |  | $ | 5.73 |
Granted |  |  | 322,636 |  |  |  | 5.78 |
Nonvested at December 31, 2018 |  |  | 502,636 |  |  | $ | 5.76 |
Restricted Stock Units (RSUs) [Member] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock units activities for the year ended December 31, 2018 and 2017:
|  | Number of Units |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2016 |  |  | - |  |  | $ | - |
Granted |  |  | 134,000 |  |  |  | 6.53 |
Nonvested at December 31, 2017 |  |  | 134,000 |  |  | $ | 6.53 |
Granted |  |  | 1,072,000 |  |  |  | 8.16 |
Vested |  |  | (173,916 | ) |  |  | 9.25 |
Nonvested at December 31, 2018 |  |  | 1,032,084 |  |  | $ | 7.77 |

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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 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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