Stock-Based Compensation (Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning balance (in shares) | shares	10
Granted during the period (in shares) | shares	483
Canceled during the period (in shares) | shares	(20)
Outstanding ending balance (in shares) | shares	473
Exercisable (in shares) | shares	43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance (usd per share) | $ / shares	$ 1,240.55
Weighted average exercise price, granted (usd per share) | $ / shares	5.24
Weighted average exercise price, canceled (use per share) | $ / shares	5.24
Weighted average exercise price, ending balance (usd per share) | $ / shares	31.82
Weighted average exercise price, exercisable (usd per share) | $ / shares	$ 299.53
Weighted average remaining contractual term, outstanding (in years)	9 years 8 months 23 days
Weighted average remaining contractual term, options exercisable (in years)	7 years 6 months 4 days
Stock options activity, aggregate intrinsic value, beginning balance | $	$ 0
Stock options activity, aggregate intrinsic value, granted | $	0
Share Based Compensation Arrangement By Share Based Payment Award Options Expired In Period Intrinsic Value | $	0
Stock options activity, aggregate intrinsic value, ending balance | $	0
Stock options activity, aggregate intrinsic value, exercisable | $	$ 0