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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Shares
Shares, Outstanding, Beginning Balance (in shares)	6,706,994	6,706,994
Shares, Granted (in shares)		1,547,627
Shares, Exercised (in shares)		(329,592)
Shares, Forfeited or expired (in shares)		(650,489)
Shares, Outstanding, Ending Balance (in shares)		7,274,540
Shares, Exercisable (in shares)		4,134,978
Shares, Vested and expected to vest (in shares)		6,954,436
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 22.33	$ 22.33
Weighted- Average Exercise Price, Granted (in dollars per share)		12.67
Weighted- Average Exercise Price, Exercised (in dollars per share)		7.31
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)		(20.90)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)		21.07
Weighted- Average Exercise Price, Exercisable (in dollars per share)		23.32
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)		$ 21.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	6 years 10 months 24 days	7 years 2 months 12 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 1 month 6 days
Aggregate Intrinsic Value, Outstanding, Ending Balance		$ 54,434
Aggregate Intrinsic Value, Exercisable		23,276
Aggregate Intrinsic Value, Vested and expected to vest		$ 51,498
Weighted-average grant-date fair value of options granted (in dollars per share)		$ 8.30	$ 14.38
Intrinsic value of options exercised		$ 2,600	$ 2,600
Cash received for options exercised		2,400	600
Fair value of shares vested		7,400	$ 6,500
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates		$ 31,200
Unrecognized compensation expense recognition period		2 years 4 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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