Stockholders' Equity (Preferred Stock and Voting Rights) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 vote $ / shares shares	Dec. 31, 2017 $ / shares shares
Stockholders' Equity Note [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value (in USD per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Number of voting rights per share | vote	1