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Segment and Geographic Area Information - Summary of Company's Revenues and Long-Lived Assets, Net, by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Long-lived assets, net $ 288   $ 253       $ 313       $ 288   $ 253 $ 313  
Revenues 2,442 $ 486 715 $ 928 $ 933 $ 385 701 $ 590 $ 5,971 $ 277 2,928 $ 1,318 2,961 7,539 $ 1,620
Country US [Member]                              
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Long-lived assets, net 288   253       313       288   253 313  
Revenues                     2,828   2,861 7,439 1,520
UNITED KINGDOM                              
Revenues from External Customers and Long-Lived Assets [Line Items]                              
Long-lived assets, net $ 0   $ 0       $ 0       0   0 0  
Revenues                     $ 100   $ 100 $ 100 $ 100