Stock-Based Compensation - Summary of Changes in CSEs Outstanding (Details) - CSEs	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Common Stock Equivalents (CSEs)
Outstanding, Beginning Balance (in shares) | shares	109,780
Granted (in shares) | shares	4,521
Converted to shares of Common Stock upon grant (in shares) | shares	(2,960)
Outstanding, Ending Balance (in shares) | shares	111,341
Per Share Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 24.96
Granted (in dollars per share) | $ / shares	153.43
Converted to shares of Common Stock upon grant (in dollars per share) | $ / shares	144.88
Outstanding, Ending Balance (in dollars per share) | $ / shares	$ 26.99