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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2019
Number of Options  
Outstanding at beginning of period (in shares) 597
Granted (in shares) 150
Exercised (in shares) (20)
Forfeited/canceled/expired (in shares) 0
Outstanding at end of period (in shares) 727
Vested and expected to vest at end of period (in shares) 727
Exercisable at end of period (in shares) 501
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) $ 44.27
Granted (in dollars per share) 27.07
Exercised (in dollars per share) 20.55
Forfeited/canceled/expired (in dollars per share) 0.00
Outstanding at end of period (in dollars per share) 41.36
Vested and expected to vest at end of period (in dollars per share) 41.36
Exercisable at end of period (in dollars per share) $ 44.56
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 4 years 22 days
Vested and expected to vest at end of period 4 years 22 days
Exercisable at end of period 3 years 2 months 9 days
Aggregate Intrinsic Value  
Exercised $ 494
Outstanding at end of period 9,149
Vested and expected to vest at end of period 9,149
Exercisable at end of period $ 5,201