Share-based Compensation - Stock Incentive Plans (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding, beginning of period (in shares) | shares	2,025,683
Granted (in shares) | shares	0
Exercised (in shares) | shares	(352,623)
Unvested options forfeited (in shares) | shares	(50,000)
Vested options expired (in shares) | shares	0
Outstanding, end of period (in shares) | shares	1,623,060
Exercisable options, vested and expected to vest (in shares) | shares	1,623,060
Weighted- Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 4.62
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	3.67
Unvested options forfeited (in dollars per share) | $ / shares	1.23
Vested options expired (in dollars per share) | $ / shares	0
Outstanding, end of period (in dollars per share) | $ / shares	4.93
Exercisable (in dollars per share) | $ / shares	$ 4.93
Weighted- Average Remaining Contractual Term (in years)
Outstanding (in years)	2 years 1 month 28 days
Exercisable (in years)	2 years 1 month 28 days
Aggregate Intrinsic Value
Outstanding | $	$ 8,714,632
Exercisable | $	$ 8,714,632