Stock-Based Compensation - Restricted Stock Activity (Details) - Shares underlying unvested restricted stock units	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Restricted Stock Units Outstanding
Beginning unvested balance (in shares) | shares	496,131
Granted (in shares) | shares	126,834
Vested (in shares) | shares	(25,602)
Canceled (in shares) | shares	(33,355)
Ending unvested balance (in shares) | shares	564,008
Weighted-Average Grant Date Fair Value
Beginning balance of options outstanding (in usd per share) | $ / shares	$ 82.08
Granted (unaudited) (in usd per share) | $ / shares	75.96
Vested (unaudited) (in usd per share) | $ / shares	80.27
Canceled (unaudited) (in usd per share) | $ / shares	75.94
Ending balance of options outstanding (in usd per share) | $ / shares	$ 81.15