Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018
Number of Options
Outstanding balance at December 31, 2017 (in shares)	2,577,860
Options granted (in shares)	235,000
Forfeited and Expired (in shares)	(300,000)
Outstanding balance at June 30, 2018 (in shares)	2,512,860
Weighted Average Exercise Price Per Option
Outstanding balance at December 31, 2017 (in dollars per share)	$ 1.17
Granted (in dollars per share)	0.65
Forfeited and Expired (in dollars per share)	0.93
Outstanding balance at June 30, 2018 (in dollars per share)	$ 1.15
Additional Disclosures
Number of options exercisable at June 30, 2018 (in shares)	1,247,489
Weighted average exercise price of options exercisable at June 30, 2018 (in dollars per share)	$ 1.62
Weighted average remaining contractual life (years), outstanding at June 30, 2018	8 years 9 months
Weighted average remaining contractual life (years), exercisable at June 30, 2018	8 years 4 months 10 days
Aggregate intrinsic value, outstanding at June 30, 2018	$ 0
Aggregate intrinsic value, exercisable at June 30, 2018	$ 0