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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Number of Options  
Outstanding at beginning of period (in shares) | shares 597
Granted (in shares) | shares 150
Exercised (in shares) | shares 0
Forfeited/canceled/expired (in shares) | shares 0
Outstanding at end of period (in shares) | shares 747
Vested and expected to vest at end of period (in shares) | shares 747
Exercisable at end of period (in shares) | shares 503
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 44.27
Granted (in dollars per share) | $ / shares 27.07
Exercised (in dollars per share) | $ / shares 0.00
Forfeited/canceled/expired (in dollars per share) | $ / shares 0.00
Outstanding at end of period (in dollars per share) | $ / shares 40.80
Vested and expected to vest at end of period (in dollars per share) | $ / shares 40.80
Exercisable at end of period (in dollars per share) | $ / shares $ 43.33
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 4 years 2 months 12 days
Vested and expected to vest at end of period 4 years 2 months 12 days
Exercisable at end of period 3 years 3 months 4 days
Aggregate Intrinsic Value  
Exercised | $ $ 0
Outstanding at end of period | $ 5,435
Vested and expected to vest at end of period | $ 5,435
Exercisable at end of period | $ $ 3,331