Stock Options, Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Unamortized Stock Compensation Expense [Abstract]
Unamortized stock compensation expense | $	$ 15,290,084
Period for recognition	2 years 11 months 19 days
Stock Options [Member]
Number of Shares [Roll Forward]
Options outstanding, ending balance (in shares)	395,000
The Plans [Member] | Stock Options [Member]
Number of Shares [Roll Forward]
Options outstanding, beginning balance (in shares)	5,316,511
Granted (in shares)	965,700
Exercised (in shares)	(25,000)
Forfeited (in shares)	(63,750)
Options outstanding, ending balance (in shares)	6,193,461
Vested and expected to vest (in shares)	6,193,461
Exercisable (in shares)	3,358,600
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 5.84
Granted (in dollars per share) | $ / shares	8.97
Exercised (in dollars per share) | $ / shares	2.04
Forfeited (in dollars per share) | $ / shares	8.20
Options outstanding, ending balance (in dollars per share) | $ / shares	6.32
Vested and expected to vest (in dollars per share) | $ / shares	6.32
Exercisable (in dollars per share) | $ / shares	$ 4.62
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]
Options outstanding, weighted average remaining contractual life	7 years 9 months
Vested and expected to vest, weighted average remaining contractual life	7 years 9 months
Exercisable, weighted average remaining contractual life	6 years 8 months 5 days
Options outstanding, aggregate intrinsic value | $	$ 19,191,512
Vested and expected to vest, aggregate intrinsic value | $	19,191,512
Exercisable, aggregate intrinsic value | $	$ 15,807,994