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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, 2020	Mar. 31, 2019	Dec. 31, 2019
Shares
Shares, Outstanding, Beginning Balance (in shares)	6,706,994
Shares, Granted (in shares)	1,403,627
Shares, Exercised (in shares)	(172,387)
Shares, Forfeited or expired (in shares)	(293,295)
Shares, Outstanding, Ending Balance (in shares)	7,644,939		6,706,994
Shares, Exercisable (in shares)	4,358,640
Shares, Vested and expected to vest (in shares)	7,306,954
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)	11.49
Weighted- Average Exercise Price, Exercised (in dollars per share)	0.94
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	(18.97)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	20.95		$ 22.33
Weighted- Average Exercise Price, Exercisable (in dollars per share)	23.05
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 21.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years 1 month 6 days		6 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable	5 years 7 months 6 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 1,185
Aggregate Intrinsic Value, Exercisable	1,184
Aggregate Intrinsic Value, Vested and expected to vest	$ 1,185
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 7.12	$ 14.65
Intrinsic value of options exercised	$ 1,100	$ 1,600
Cash received for options exercised	200	300
Fair value of shares vested	3,700	$ 3,100
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 33,000
Unrecognized compensation expense recognition period	2 years 8 months 12 days

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

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