Equity - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding, beginning of period (in shares)	2,885,334
Granted (in shares)	0	0	0
Exercised (in shares)	(508,300)
Unvested options forfeited (in shares)	0
Vested options expired (in shares)	(351,351)
Outstanding, end of period (in shares)	2,025,683	2,885,334
Exercisable, end of period (in shares)	2,025,683
Weighted- Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 4.42
Granted (in dollars per share)	0
Exercised (in dollars per share)	2.62
Unvested options forfeited (in dollars per share)	0
Vested options expired (in dollars per share)	5.90
Outstanding, weighted average exercise price, end of period (in dollars per share)	4.62	$ 4.42
Exercisable (in dollars per share)	$ 4.62
Weighted- Average Remaining Contractual Term (in years)
Outstanding options (in years)	2 years 1 month 6 days
Exercisable (in years)	2 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding	$ 9,054,128
Exercisable	$ 9,054,128