Annual report pursuant to Section 13 and 15(d)

Segment Information and Geographic Data - Revenue by Geographic Location (Details)

v3.20.4
Segment Information and Geographic Data - Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues $ 50,030 $ 29 $ 29 $ 30 $ 29 $ 230 $ 29 $ 30 $ 50,118 $ 318 $ 463
Japan                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 50,000 0 0
China                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 118 118 118
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 $ 0 $ 200 $ 345