Annual report pursuant to Section 13 and 15(d)

Commitments - Schedule of Rent Expense (Detail)

v3.20.1
Commitments - Schedule of Rent Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]      
Operating lease $ 378 $ 378 $ 378
Short-term leases 68 27 0
Total $ 446 $ 405 $ 378