Significant Accounting Policies Fair Value Assumptions Using Black-Scholes-Merton Option Pricing Model (Details) - Valuation Technique, Option Pricing Model	Dec. 31, 2019 $ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Time until expiration (years)	4 years 3 months 18 days
Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement inputs	3.78
Exercise price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement inputs	7.63
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement inputs	0.70
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement inputs	0.017
Expected dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement inputs	0.00