Stock-Based Compensation - Options Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Shares (in thousands)
Options outstanding, beginning of period (in shares) | shares	5,311
Granted (in shares) | shares	946
Exercised (in shares) | shares	(1)
Canceled (in shares) | shares	(75)
Options outstanding, end of period (in shares) | shares	6,181
Weighted- Average Exercise Price per Share
Outstanding weighted average exercise price, beginning balance (in usd per share) | $ / shares	$ 29.12
Granted weighted average exercise price (in usd per share) | $ / shares	18.96
Exercised weighted average exercise price (in usd per share) | $ / shares	10.33
Canceled weighted average exercise price (in usd per share) | $ / shares	33.73
Outstanding weighted average exercise price, ending balance (in usd per share) | $ / shares	$ 27.51