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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 27, 2017
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved (in shares)   21,272,531 73,655,190
2004 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved (in shares)   0  
Unrecognized stock-based compensation   $ 20,977  
Employee Stock | 2017 Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved (in shares) 1,600,000    
Common Stock, Capital Shares Reserved for Future Issuance, Annual Increase, Duration 10 years    
Percentage of common stock, outstanding 1.00%    
Employee Stock Option | 2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual increase period   10 years  
Expected life   10 years