Stockholders' Equity - Summary of Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of stock options
Shares, Outstanding, Beginning Balance	128	121
Stock Options Outstanding, Granted	315	25
Stock Options Outstanding, Forfeited	(35)	(18)
Shares, Outstanding, Ending Balance	408	128
Shares, Exercisable at December 31, 2016	213
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 11.25	$ 22.74
Weighted Average Exercise Price, Granted	3.06	6.48
Weighted Average Exercise Price, Forfeited	18.31	81.59
Weighted Average Exercise Price, Outstanding, Ending Balance	4.32	$ 11.25
Weighted Average Exercise Price, Exercisable at December 31, 2016	$ 5.48
Aggregate Intrinsic Value, Outstanding	$ 42,350
Aggregate Intrinsic Value, Exercisable at December 31, 2016	$ 32,900
Weighted Average Remaining Contractual Life (Years), Outstanding	8 years 2 months 12 days
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2016	6 years 7 months 6 days