Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share	18,764,000	16,102,000
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share	3,936,000	2,256,000
Stock-Settled Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share	25,000	84,000
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share	607,000	220,000
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share	14,196,000	13,542,000