Annual report pursuant to Section 13 and 15(d)

Permit and Other Intangible Assets - Schedule of Intangible Assets (Details)

v3.21.1
Permit and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance $ 8,790 $ 8,443
PCB permit amortized   (7)
Permits in progress 132 354
Balance $ 8,922 $ 8,790