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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Shares
Shares, Outstanding, Beginning Balance (in shares)	6,706,994
Shares, Granted (in shares)	1,816,277
Shares, Exercised (in shares)	(448,732)
Shares, Forfeited or expired (in shares)	(735,322)
Shares, Outstanding, Ending Balance (in shares)	7,339,217		6,706,994
Shares, Exercisable (in shares)	4,407,713
Shares, Vested and expected to vest (in shares)	7,027,237
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 22.33
Weighted- Average Exercise Price, Granted (in dollars per share)	14.97
Weighted- Average Exercise Price, Exercised (in dollars per share)	9.93
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	(20.78)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	21.42		$ 22.33
Weighted- Average Exercise Price, Exercisable (in dollars per share)	23.03
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 21.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years		6 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable	5 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 39,014
Aggregate Intrinsic Value, Exercisable	18,806
Aggregate Intrinsic Value, Vested and expected to vest	$ 36,973
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 10.50	$ 14.33
Intrinsic value of options exercised	$ 3,900	$ 2,800
Cash received for options exercised	4,500	700
Fair value of shares vested	12,400	$ 12,800
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 31,700
Unrecognized compensation expense recognition period	2 years 6 months

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

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