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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Financial Liabilities Measured at Fair Value on Recurring Basis by Level Within Fair Value Hierarchy | The following tables set forth the financial liabilities measured at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2018 and 2017.
|  | Fair Value Measurements as of December 31, 2018 (in thousands) |
Description |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants |  | $ | - |  |  | $ | - |  |  | $ | 1,566 |  |  | $ | 1,566 |
|  | Fair Value Measurements as of December 31, 2017 (in thousands) |
Description |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants |  | $ | - |  |  | $ | - |  |  | $ | 1,357 |  |  | $ | 1,357 |
Schedule of Fair Value Measurement Hierarchy of Derivative Liability | The following table presents a reconciliation of the derivative liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2018 and 2017 (in thousands):
|  | Common Stock Warrants |
Balance at December 31, 2016 |  | $ | (3,665 | )
Issuance of derivatives |  |  | (810 | )
Change in fair value |  |  | 3,118 |
Balance at December 31, 2017 |  |  | (1,357 | )
Issuance of derivatives |  |  | (7,577 | )
Change in fair value |  |  | 7,005 |
Exercise of warrants |  |  | 575 |
Other, net |  |  | (212 | )
Balance at December 31, 2018 |  | $ | (1,566 | )
Black-Scholes-Merton Valuation Model [Member] |
Schedule of Assumptions Used in Estimating Fair Value | The assumptions used in estimating the common stock warrant liability using the Black-Scholes-Merton valuation model at December 31, 2018 and 2017 were as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
Weighted-average risk-free interest rate |  |  | 2.51 | % |  |  | 1.89 | %
Weighted-average expected life (in years) |  |  | 0.9 |  |  |  | 1.9 |
Expected dividend yield |  |  | - | % |  |  | - | %
Weighted average expected volatility |  |  | 157 | % |  |  | 107 | %
Monte Carlo Simulation Valuation Model [Member] |
Schedule of Assumptions Used in Estimating Fair Value | The assumptions used in estimating the common stock warrant liability using the Monte Carlo Simulation valuation model at December 31, 2018 and 2017 were as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
Weighted-average risk-free interest rate |  |  | 2.46 | % |  |  | 2.20 | %
Weighted-average expected life (in years) |  |  | 3.1 |  |  |  | 3.6 |
Expected dividend yield |  |  | - | % |  |  | - | %
Weighted average expected volatility |  |  | 68 | % |  |  | 64 | %

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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