Stock Based Compensation - Employee and Director Stock Option Activity (Details) - Employees, Directors and Consultants	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	4,006,351
Granted (in shares) | shares	638,563
Exercised (in shares) | shares	(223,643)
Forfeited (in shares) | shares	(459,781)
Ending balance (in shares) | shares	3,961,490
Vested (in shares) | shares	1,022,419
Exercisable (in shares) | shares	1,022,419
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 10.92
Granted (in dollars per share) | $ / shares	14.95
Exercised (in dollars per share) | $ / shares	7.87
Forfeited (in dollars per share) | $ / shares	12.22
Ending balance (in dollars per share) | $ / shares	11.59
Vested (in dollars per share) | $ / shares	11.72
Exercisable (in dollars per share) | $ / shares	$ 11.72