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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Estimated future amortization expense for intangible assets as of December 31, 2019 is as follows:
| For the Year Ending December 31
| (in thousands)
2020 | $ | 1,766 |
2021 | 1,766 |
2022 | 1,766 |
2023 | 1,766 |
2024 | 1,766 |
Thereafter | 10,886 |
| $ | 19,716 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions |
| Expected Volatility |  | Risk-free Interest Rate |  | Expected Term |  | Dividend Rate
December 31, 2019: |  |  |  |  |  |  |  |
Employees | 88% |  |  | 2.2% |  |  | 4 |  | 0 | %
Officers and non-employee directors | 77% |  |  | 2.6% |  |  | 8 |  | 0 | %
December 31, 2018: |  |  |  |  |  |  |  |  |
Employees | 58% |  |  | 2.6% |  |  | 4 |  | 0 | %
Officers and non-employee directors | 63% |  |  | 2.8% |  |  | 8 |  | 0 | %
December 31, 2017: |  |  |  |  |  |  |  |  |  |
Employees | 61% |  |  | 1.7% |  |  | 4 |  | 0 | %
Officers and non-employee directors | 70% |  |  | 2.2% |  |  | 8 |  | 0 | %

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- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + 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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