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Fair Value Measurements (Valuation Techniques of Level 3 Liabilities) (Details) - Level 3	Mar. 31, 2019 yr $ / shares	Dec. 31, 2018 yr $ / shares
Interest rate reset | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stock price (in dollars per share) | $ / shares	$ 20.25	$ 14.43
Interest rate reset | Discounted cash flow | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.240	0.250
Interest rate reset | Discounted cash flow | Risk-free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.022	0.025
Interest rate reset | Discounted cash flow | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.371	0.439
Interest rate reset | Discounted cash flow | Term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input | yr	2.79	3.04
Change of control redemption | Option pricing model | Risk-free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.022	0.025
Change of control redemption | Option pricing model | Probability | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.00	0.00
Change of control redemption | Option pricing model | Probability | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability, measurement input	0.10	0.10

X

- Definition

Value of input used to measure derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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+ References

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Price of a single share of a number of saleable stocks of a company.

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