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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Compensation cost recognized $ 6,420,000 $ 3,614,000  
Allocated Share-based Compensation Expense 6,420,000 3,614,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]      
Compensation cost recognized 6,200,000 3,500,000  
Unrecognized compensation cost related to non-vested awards granted 67,100,000   $ 36,600,000
Allocated Share-based Compensation Expense $ 6,200,000 3,500,000  
Restricted Stock [Member]      
Nonvested at January 1, 2018 605,566    
Shares, Granted 612,547    
Shares, Vested (15,032)    
Shares, Canceled (12,500)    
Nonvested at March 31, 2018 1,190,581    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2018 $ 51.57    
Weighted-Average Grant-Date Fair Value, Granted 26.09    
Weighted-Average Grant-Date Fair Value, Vested 62.75    
Weighted-Average Grant-Date Fair Value, Canceled 83.26    
Weighted-Average Grant-Date Fair Value, Nonvested at March 30, 2018 $ 37.99    
Weighted-average period to recognize compensation cost (in years) 5 years 8 months 27 days    
Restricted Stock Units (RSUs) [Member]      
Nonvested at January 1, 2018 38,400    
Shares, Granted 12,614    
Shares, Vested (3,020)    
Shares, Canceled 0    
Nonvested at March 31, 2018 47,994    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 38,597    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 7 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term 1 year 9 months 26 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 3,787,686    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 3,046,076    
Weighted-average period to recognize compensation cost (in years) 3 years 5 months 23 days    
Employee Stock Option [Member]      
Compensation cost recognized $ 232,000 100,000  
Unrecognized compensation cost related to non-vested awards granted $ 7,700,000   $ 200,000
Weighted-average period to recognize compensation cost (in years) 7 years 6 months 26 days    
Allocated Share-based Compensation Expense $ 232,000 $ 100,000