Stockholders' Equity - Summary of Warrant Activity (Details) - Warrants - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Class Of Warrant Or Right [Line Items]
Number of Shares, Outstanding at beginning of period	317,630
Number of Shares, Options Caneled/forfeited	(306,656)
Number of Shares, Outstanding at end of period	10,974	317,630
Weighted Average Exercise Price, Warrants
Weighted Average Exercise Price, Outstanding at beginning of period	$ 123.61
Weighted Average Exercise Price, Options Canceled/forfeited	135.58
Weighted Average Exercise Price, Outstanding at end of period	$ 124.27	$ 123.61
Weighted Average Remaining Contract Term, Warrants
Weighted Average Remaining Contract Term, Outstanding at beginning of period		6 months 14 days
Weighted Average Remaining Contract Term, Exercisable at beginning of period	3 months 11 days
Intrinsic Value, Warrants
Intrinsic Value, Outstanding at beginning of period	$ 0
Intrinsic Value, Outstanding at end of period		$ 0
Intrinsic Value, Exercisable at end of period	$ 0