Stock-Based Compensation (Details 1) - Employee Stock Option	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Options
Number of Options Outstanding, Balance Beginning (in shares) | shares	4,105,369
Number of Options Issued (in shares) | shares	464,895
Number of Options Exercised (in shares) | shares	(171,566)
Number of Options Forfeited (in shares) | shares	(68,585)
Number of Options Expired (in shares) | shares	0
Number of Options Outstanding, Balance Ending (in shares) | shares	4,330,113
Number of Options Exercisable (in shares) | shares	2,949,806
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	7.31
Exercised, Exercise Price (in dollars per share) | $ / shares	1.56
Forfeited, Exercise Price (in dollars per share) | $ / shares	7.28
Expired, Exercise Price (in dollars per share) | $ / shares	0.00
Shares Outstanding Exercise Price, Balance Ending (in dollars per share) | $ / shares	5.12
Exercisable, Exercise Price (in dollars per share) | $ / shares	$ 3.87