Shareholders’ Equity (Stock Option and Restricted Stock Award Activity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares Underlying Stock Options and Restricted Stock Awards
Outstanding beginning balance, Shares underlying stock options and restricted stock awards (in shares)	2,318,685	618,900	54,000
Granted, Shares underlying stock options and restricted stock awards (in shares)	483,200	1,769,785	567,876
Restricted stock awards vested, Shares underlying stock options and restricted stock awards (in shares)			(2,976)
Exercised, Shares underlying stock options and restricted stock awards (in shares)	(17,548)	(51,814)	0
Forfeited, Shares underlying stock options and restricted stock awards (in shares)	(156,875)	(18,186)
Outstanding ending balance, Shares underlying stock options and restricted stock awards (in shares)	2,627,462	2,318,685	618,900
Vested and expected to vest ending balance, Shares underlying stock options (in shares)	2,627,462
Exercisable ending balance, Shares underlying stock options (in shares)	1,105,029
Weighted-Average Exercise Price per Share
Outstanding beginning balance, Weighted - average exercise price (in dollars per share)	$ 22.01	$ 9.54	$ 6.00
Granted, Weighted - average exercise price (in dollars per share)	17.83	25.89	9.88
Vested, Weighted - average exercise price (in dollars per share)			0.00
Exercised, Weighted - average exercise price (in dollars per share)	8.52	10.81
Forfeited, Weighted - average exercise price (in dollars per share)	26.35	7.80
Outstanding ending balance, Weighted - average exercise price (in dollars per share)	21.07	$ 22.01	$ 9.54
Vested and expected to vest ending balance, Weighted - average exercise price (in dollars per share)	21.07
Exercisable ending balance, Weighted - average exercise price (in dollars per share)	$ 20.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding ending balance, Weighted - average remaining contractual term (yrs)	8 years 4 months 20 days
Outstanding ending balance, Aggregate intrinsic value	$ 4,307,756
Vested and expected to vest ending balance, Weighted - average remaining contractual term (yrs)	8 years 4 months 20 days
Vested and expected to vest ending balance, Aggregate intrinsic value	$ 4,307,756
Exercisable ending balance, Weighted - average remaining contractual term (yrs)	7 years 10 months 5 days
Exercisable ending balance, Aggregate intrinsic value	$ 2,740,900