Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discount rate, present value of future revenue	10.00%
Impairment charges	$ 0	$ 0
Capitalized general and administrative costs	8,200,000	8,400,000
Interest costs capitalized	$ 1,400,000	$ 1,600,000
Options
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities (in shares)	2.7	2.8
Restricted Stock Units (RSUs)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities (in shares)		0.4
Restricted Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities (in shares)		0.8