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Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other expense, net $ 6,142 $ 62 $ 908
Financial Assets:      
Cash Equivalents 117,138    
Financial Liabilities:      
Total financial liabilities   1,104  
Level I      
Financial Assets:      
Cash Equivalents 117,138    
Financial Liabilities:      
Total financial liabilities   0  
Level II      
Financial Assets:      
Cash Equivalents 0    
Financial Liabilities:      
Total financial liabilities   0  
Level III      
Financial Assets:      
Cash Equivalents 0    
Financial Liabilities:      
Total financial liabilities   1,104  
Money market funds      
Financial Assets:      
Cash Equivalents 117,138    
Money market funds | Level I      
Financial Assets:      
Cash Equivalents 117,138    
Money market funds | Level II      
Financial Assets:      
Cash Equivalents 0    
Money market funds | Level III      
Financial Assets:      
Cash Equivalents 0    
Redeemable convertible preferred stock warrant liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other expense, net $ 6,100 100 $ 100
Financial Liabilities:      
Total financial liabilities   1,104  
Redeemable convertible preferred stock warrant liability | Level I      
Financial Liabilities:      
Total financial liabilities   0  
Redeemable convertible preferred stock warrant liability | Level II      
Financial Liabilities:      
Total financial liabilities   0  
Redeemable convertible preferred stock warrant liability | Level III      
Financial Liabilities:      
Total financial liabilities   $ 1,104