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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Inventory Disclosure [Abstract]      
Raw materials $ 436   $ 412
Work in process 440   258
Finished goods 209   320
Total 1,085   $ 990
Inventory write-off $ 169 $ 0