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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares |  |  |
December 31, 2016 | 4,504,642 |  |
Granted | 1,269,844 |  |
Options exercised or RSUs vested | (285,432) |  |
Forfeited or expired | (215,090) |  |
December 31, 2017 | 5,273,964 | 4,504,642 |
Exercisable | 3,544,139 |  |
Vested and expected to vest | 5,086,009 |  |
Weighted-Average Exercise Price |  |  |
December 31, 2016 | $ 19.79 |  |
Granted | 27.18 |  |
Options exercised or RSUs vested | 4.22 |  |
Forfeited or expired | 24.43 |  |
December 31, 2017 | 22.23 | $ 19.79 |
Exercisable | 20.60 |  |
Vested and expected to vest | $ 22.10 |  |
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 | 7 years |
Weighted-average remaining contractual term, Exercisable | 5 years 10 months 24 days |  |
Weighted-average remaining contractual term, Vested and expected to vest | 6 years 8 months 12 days |  |
Aggregate intrinsic value, Outstanding | $ 7,969 |  |
Aggregate intrinsic value, Exercisable | 7,969 |  |
Aggregate intrinsic value, Vested and expected to vest | $ 7,969 |  |
Common stock, shares issued (in shares) | 274,362 | 253,036 | 526,715
Cash proceeds from exercise of stock options | $ 900 | $ 500 | $ 1,900
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 17.90 | $ 12.53 | $ 15.17
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value | $ 5,200 | $ 4,200 | $ 10,800
Fair value of shares vested | 16,400 | $ 14,600 | $ 11,600
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 24,200 |  |
Unrecognized compensation expense recognition period | 2 years 7 months 6 days |  |

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