Stock-Based Compensation - Employee and Director Stock Option Activity (Details) - Employees, Directors and Consultants	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	3,616,314
Granted (in shares) | shares	18,628
Exercised (in shares) | shares	(56,923)
Forfeited (in shares) | shares	(70,624)
Ending balance (in shares) | shares	3,507,395
Vested (in shares) | shares	1,171,348
Exercisable (in shares) | shares	1,171,348
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 14.66
Granted (in dollars per share) | $ / shares	86.57
Exercised (in dollars per share) | $ / shares	12.76
Forfeited (in dollars per share) | $ / shares	7.94
Ending balance (in dollars per share) | $ / shares	15.21
Vested (in dollars per share) | $ / shares	12.98
Exercisable (in dollars per share) | $ / shares	$ 12.98