Share-Based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Number of Options
Outstanding balance at December 31, 2017 (in shares) | shares	2,577,860
Options granted (in shares) | shares	125,000
Outstanding balance at March 31, 2018 (in shares) | shares	2,702,860
Weighted Average Exercise Price Per Option
Outstanding balance at December 31, 2017 (in dollars per share) | $ / shares	$ 1.17
Granted (in dollars per share) | $ / shares	0.65
Outstanding balance at March 31, 2018 (in dollars per share) | $ / shares	$ 1.15
Additional Disclosures
Number of options exercisable at March 31, 2018 (in shares) | shares	1,187,871
Weighted average exercise price of options exercisable at March 31, 2018 (in dollars per share) | $ / shares	$ 1.68
Weighted average remaining contractual life (years), outstanding at March 31, 2018	8 years 6 months
Weighted average remaining contractual life (years), exercisable at March 31, 2018	8 years 7 months 6 days
Aggregate intrinsic value, outstanding at March 31, 2018 | $	$ 0
Aggregate intrinsic value, exercisable at March 31, 2018 | $	$ 0