General form of registration statement for all companies including face-amount certificate companies

Revenues - Summary of Disaggregation of Revenue (Detail)

v3.21.2
Revenues - Summary of Disaggregation of Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]            
Revenue $ 7,937 $ 5,317 $ 22,596 $ 14,728 $ 21,135 $ 13,713
Point in time [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 3,104 2,128 7,565 3,300 5,405 2,505
Over time [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 4,833 3,189 15,031 11,428 15,730 11,208
US Federal Government and Agencies [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 6,590 3,831 18,897 11,699 17,050 11,680
Commercial and Other [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 1,347 1,486 3,699 3,029 4,085 2,033
US [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 6,704 3,875 19,063 11,853 17,239 11,908
Middle East [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 607 1,249 1,987 2,446 3,185 1,537
Asia [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 343 183 1,113 397 668 268
Other [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 283 10 433 32 43  
Imagery [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 2,773 814 5,621 1,222 3,005 623
Data, Software and Analytics [Member]            
Disaggregation of Revenue [Line Items]            
Revenue 3,756 4,720 12,023 12,038 15,732 12,702
Engineering and Integration [Member]            
Disaggregation of Revenue [Line Items]            
Revenue $ 1,408 $ (217) $ 4,952 $ 1,468 $ 2,398 $ 388