Stock-Based Compensation (Details 1) - Employee Stock Option	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Number of Options
Number of options outstanding, balance beginning (in shares) | shares	4,299,810
Number of options Issued (in shares) | shares	580,535
Number of options exercised (in shares) | shares	0
Number of options forfeited (in shares) | shares	(84,740)
Number of options expired (in shares) | shares	0
Number of options outstanding, balance ending (in shares) | shares	4,795,605
Number of options exercisable (in shares) | shares	3,553,271
Weighted Average Exercise Price
Shares outstanding exercise price, balance beginning (in dollars per share) | $ / shares	$ 4.76
Issued, exercise price (in dollars per share) | $ / shares	3.33
Exercised, exercise price (in dollars per share) | $ / shares	0.00
Forfeited, exercise price (in dollars per share) | $ / shares	7.43
Expired, exercise price (in dollars per share) | $ / shares	0.00
Shares outstanding exercise price, balance ending (in dollars per share) | $ / shares	4.84
Exercisable, exercise price (in dollars per share) | $ / shares	$ 4.63