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Fair Value Measurements - Schedule of Assumptions Used in Estimating Fair Value (Details) - Common Stock Warrants [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Risk-Free Interest Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 2.51% | 1.89%
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Expected Life [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, term | 10 months 25 days | 1 year 10 months 25 days
Black-Scholes-Merton Valuation Model [Member] | Expected Dividend Yield [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 0.00% | 0.00%
Black-Scholes-Merton Valuation Model [Member] | Weighted-Average Expected Volatility [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 157.00% | 107.00%
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Risk-Free Interest Rate [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 2.46% | 2.20%
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Expected Life [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, term | 3 years 1 month 6 days | 3 years 7 months 6 days
Monte Carlo Simulation Valuation Model [Member] | Expected Dividend Yield [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 0.00% | 0.00%
Monte Carlo Simulation Valuation Model [Member] | Weighted-Average Expected Volatility [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value assumptions, measurement input, percentages | 68.00% | 64.00%

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