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Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Beginning Balance (in shares)	5,273,964
Granted (in shares)	1,946,770
Exercised (in shares)	(219,045)
Forfeited or expired (in shares)	(294,695)
Ending Balance (in shares)	6,706,994	5,273,964
Exercisable (in shares)	4,298,178
Vested and expected to vest (in shares)	6,446,218
Weighted-Average Exercise Price
Beginning Balance (in dollars per share)	$ 22.23
Granted (in dollars per share)	20.81
Exercised (in dollars per share)	3.03
Forfeited or expired (in dollars per share)	24.72
Ending Balance (in dollars per share)	22.33	$ 22.23
Exercisable (in dollars per share)	22.21
Vested and expected to vest (in dollars per share)	$ 22.31
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	6 years 9 months 18 days
Weighted-average remaining contractual term, Exercisable	5 years 10 months 24 days
Weighted-average remaining contractual term, Vested and expected to vest	6 years 10 months 24 days
Aggregate intrinsic value, Outstanding	$ 4,749
Aggregate intrinsic value, Exercisable	4,712
Aggregate intrinsic value, Vested and expected to vest	$ 4,746
Weighted-Average Grant Date Fair Value
Common stock, shares issued (in shares)	219,045	274,362	253,036
Cash proceeds from exercise of stock options	$ 700	$ 900	$ 500
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 13.98	$ 17.90	$ 12.53
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value	$ 2,900	$ 5,200	$ 4,200
Fair value of shares vested	17,700	$ 16,400	$ 14,600
Unrecognized compensation cost related to non-vested stock-based compensation arrangements	$ 30,200
Unrecognized compensation expense recognition period	2 years 7 months 6 days
Stock Incentive Plan 2013
Shares
Ending Balance (in shares)	6,156,422
Weighted-Average Exercise Price
Ending Balance (in dollars per share)	$ 24.12
Restricted Stock Units
Shares
Beginning Balance (in shares)	0
Granted (in shares)	467,600
Exercised (in shares)	0
Forfeited (in shares)	(15,100)
Ending Balance (in shares)	452,500	0
Weighted-Average Grant Date Fair Value
Beginning Balance (in dollars per share)	$ 0
Granted (in dollars per share)	15.32
Exercised (in dollars per share)	0
Forfeited or expired (in dollars per share)	15.32
Ending Balance (in dollars per share)	$ 15.32	$ 0
Unrecognized compensation expense recognition period	1 year 7 months 6 days
Awards granted in period (in shares)	467,600
Total unrecognized compensation cost	$ 5,300
Restricted Stock Units | Stock Incentive Plan 2013
Shares
Granted (in shares)		0	0
Weighted-Average Grant Date Fair Value
Awards granted in period (in shares)		0	0

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