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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Jul. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock exercised (in shares)       106,370
Intrinsic value of common stock exercised       $ 1,400
Unamortized share-based compensation expense       $ 89,100
Recognized weighted average period       2 years 9 months 50 days
Warrants outstanding (in shares)       10,000
Warrants exercised during period (in shares)       83,013
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock issued during period (in shares)       43,056
2013 Equity Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant (in shares)       1,038,400
Additional shares reserved for future issuance (in shares)       6,768,264
2018 Employee Stock Purchase Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant (in shares)       750,000
Percentage of purchase price 85.00%      
Share purchase annual cap $ 25      
Share purchase annual cap, percent of employee's annual cash compensation 10.00%      
Award vesting period 1 year      
Shares issued during period (in shares)       0
Public Stock Offering [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock issued (in shares)     3,731,344  
Price per share (usd per share)     $ 33.50  
Gross proceeds     $ 125,000  
Proceeds, net of underwriting commissions     117,500  
Underwriting commissions     $ 7,500  
Underwritten Public Offering [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock issued (in shares)   3,910,000    
Price per share (usd per share)   $ 29.50    
Gross proceeds   $ 115,300    
Proceeds, net of underwriting commissions   109,800    
Underwriting commissions   $ 5,500