Stock-Based Compensation - Service Based Stock Options (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares Underlying Options
Exercised (in shares)	(30,000)	(267,500)
Weighted Average Exercise Price
Exercised (in dollars per share)	$ 4.93	$ 3.09
Stock option awards - Service based awards
Shares Underlying Options
Outstanding at the beginning of the period (in shares)	7,856,480	6,906,001
Granted (in shares)	1,103,938	1,447,479
Exercised (in shares)	(30,000)	(267,500)
Forfeited (in shares)	(720,394)	(229,500)
Outstanding at the end of the period (in shares)	8,210,024	7,856,480	6,906,001
Exercisable at end of period (in shares)	6,481,095
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 7.50	$ 7.92
Granted (in dollars per share)	3.37	4.55
Exercised (in dollars per share)	4.93	3.09
Forfeited (in dollars per share)	6.24	6.59
Outstanding at the end of the period (in dollars per share)	7.06	$ 7.50	$ 7.92
Exercise price (in dollars per share)	$ 7.97
Weighted Average Remaining Contractual Term
Outstanding	5 years 1 month 6 days	5 years 2 months 12 days	5 years 1 month 6 days
Granted	9 years	9 years 3 months 18 days
Exercisable	4 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding	$ 107,150	$ 0	$ 976,355
Granted	$ 107,150
Exercisable at end of period	$ 0