Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Basis of Presentation (Details)

v3.19.3
Summary of Significant Accounting Policies - Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies                    
Cash and cash equivalents $ 39,409           $ 39,409   $ 68,379  
Marketable securities - available-for-sale debt securities 63,451           63,451   136,755  
Total stockholders' equity 147,683 $ 186,991 $ 219,655 $ 276,155 $ 165,102 $ 191,679 147,683 $ 276,155 $ 246,885 $ 202,984
Net (loss) income attributable to ordinary shareholders (39,302) $ (41,087) $ (27,412) 5,242 $ (43,845) $ (20,738) (107,801) (59,341)    
Net cash used in operating activities             (99,979) (72,703)    
Revenue $ 237     $ 40,792     $ 394 $ 58,026