Stock-Based Compensation - Summary Of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of Shares
Outstanding beginning balance (in shares) | shares	4,557,186
Granted (in shares) | shares	0
Exercised (in shares) | shares	(212,242)
Forfeited (in shares) | shares	(20,011)
Expired (in shares) | shares	0
Outstanding ending balance (in shares) | shares	4,324,933
Exercisable ending balance (in shares) | shares	3,967,091
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share) | $ / shares	$ 5.14
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	5.49
Forfeited (in dollars per share) | $ / shares	14.00
Expired (in dollars per share) | $ / shares	0
Outstanding ending balance (in dollars per share) | $ / shares	5.08
Exercisable ending balance (in dollars per share) | $ / shares	$ 4.28