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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Shares
Shares, Outstanding, Beginning Balance (in shares)	7,258,353
Shares, Granted (in shares)	1,555,796
Shares, Exercised (in shares)	(144,249)
Shares, Forfeited or expired (in shares)	(66,463)
Shares, Outstanding, Ending Balance (in shares)	8,603,437		7,258,353
Shares, Exercisable (in shares)	4,825,295
Shares, Vested and expected to vest (in shares)	8,167,732
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 21.48
Weighted- Average Exercise Price, Granted (in dollars per share)	19.52
Weighted- Average Exercise Price, Exercised (in dollars per share)	17.59
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	17.98
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	21.21		$ 21.48
Weighted- Average Exercise Price, Exercisable (in dollars per share)	22.96
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 21.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years 2 months 12 days		6 years 9 months 18 days
Weighted- Average Remaining Contractual Term, Exercisable	5 years 8 months 12 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 91,820
Aggregate Intrinsic Value, Exercisable	43,209
Aggregate Intrinsic Value, Vested and expected to vest	$ 86,309
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 14.23	$ 7.12
Intrinsic value of options exercised	$ 1,400	$ 1,100
Cash received for options exercised	2,500	200
Fair value of shares vested	4,100	$ 3,700
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 42,300
Unrecognized compensation expense recognition period	2 years 10 months 24 days

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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