Stockholders' Equity, Stockholder Rights Agreement (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Apr. 20, 2016 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares
Class of Warrant or Right [Line Items]
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock (in shares) | shares	1
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Dividend distribution, date declared		Apr. 20, 2016
Dividend distribution, date to be paid		May 03, 2016
Dividend distribution, date of record		May 03, 2016
Net operating loss carryforwards (NOLs) | $	$ 141
Minimum threshold percentage of beneficial ownership by Acquiring Person that would trigger exercisability of rights	4.99%
Multiple of purchase price of common stock in event of person becoming Acquiring Person	2
Series B Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Number of shares of preferred stock to be purchased with each exercisable right (in shares) | shares	0.001
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Purchase price (in dollars per share) | $ / shares	$ 3.00
Number of shares of common stock that would give the same dividend, voting and liquidation rights as each unit of preferred stock (in shares) | shares	1