Stock-Based Compensation - Summary Of Changes In CSEs Outstanding (Details) - Common stock equivalents	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Right to receive, shares	1
Base fee percentage (up to)	50.00%
Common Stock Equivalents (CSEs) [Roll Forward]
Outstanding beginning balance (in shares)	109,780
Granted (in shares)	3,410
Converted to shares of Common Stock upon grant (in shares)	(2,199)
Outstanding ending balance (in shares)	110,991
Per Share Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding beginning balance (in dollars per share) | $ / shares	$ 24.96
Granted (in dollars per share) | $ / shares	152.58
Converted to shares of Common Stock upon grant (in dollars per share) | $ / shares	146.28
Outstanding ending balance (in dollars per share) | $ / shares	$ 26.48