Stock-Based Compensation - Summary Of Changes In CSEs Outstanding (Details) - Common stock equivalents	3 Months Ended
	Mar. 31, 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)	1,119
Converted to common shares upon grant (in shares)	(852)
Outstanding ending balance (in shares)	110,047
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	154.98
Converted to common shares upon grant (in dollars per share) | $ / shares	125.85
Outstanding ending balance (in dollars per share) | $ / shares	$ 25.50