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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Beginning Balance (in shares)	6,706,994
Granted (in shares)	1,851,327
Exercised (in shares)	(504,445)
Forfeited or expired (in shares)	(795,523)
Ending Balance (in shares)	7,258,353	6,706,994
Exercisable (in shares)	4,660,921
Vested and expected to vest (in shares)	6,973,272
Weighted-Average Exercise Price
Beginning Balance (in dollars per share)	$ 22.33
Granted (in dollars per share)	15.11
Exercised (in dollars per share)	10.56
Forfeited or expired (in dollars per share)	20.72
Ending Balance (in dollars per share)	21.48	$ 22.33
Exercisable (in dollars per share)	22.92
Vested and expected to vest (in dollars per share)	$ 21.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term, Outstanding	6 years 9 months 18 days	6 years 10 months 24 days
Weighted-average remaining contractual term, Exercisable	5 years 9 months 18 days
Weighted-average remaining contractual term, Vested and expected to vest	6 years 8 months 12 days
Aggregate intrinsic value, Outstanding	$ 27,409
Aggregate intrinsic value, Exercisable	13,906
Aggregate intrinsic value, Vested and expected to vest	$ 26,011
Weighted-Average Grant Date Fair Value
Common stock, shares issued (in shares)	504,445	219,045	274,362
Cash proceeds from exercise of stock options	$ 5,300	$ 700	$ 900
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 10.68	$ 13.98	$ 17.90
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value	$ 4,300	$ 2,900	$ 5,200
Fair value of shares vested	16,700	$ 17,700	$ 16,400
Unrecognized compensation cost related to non-vested stock-based compensation arrangements	$ 27,500
Unrecognized compensation expense recognition period	2 years 4 months 24 days
Stock Incentive Plan 2013
Shares
Ending Balance (in shares)	7,008,394
Weighted-Average Exercise Price
Ending Balance (in dollars per share)	$ 22.14
Restricted Stock Units
Shares
Beginning Balance (in shares)	452,500
Granted (in shares)	15,000
Exercised (in shares)	(210,950)
Forfeited (in shares)	(47,300)
Ending Balance (in shares)	209,250	452,500
Weighted-Average Grant Date Fair Value
Beginning Balance (in dollars per share)	$ 15.32
Granted (in dollars per share)	23.68
Exercised (in dollars per share)	15.32
Forfeited or expired (in dollars per share)	15.32
Ending Balance (in dollars per share)	$ 15.92	$ 15.32
Unrecognized compensation expense recognition period	8 months
Awards granted in period (in shares)	15,000
Total unrecognized compensation cost	$ 2,000

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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