Annual report pursuant to Section 13 and 15(d)

Commitments - Off Take Sales Agreements (Details)

v3.10.0.1
Commitments - Off Take Sales Agreements (Details)
lb in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
lb
Commitments [Abstract]  
2019 Commitment (in pounds) | lb 500
2020 Commitment (in pounds) | lb 390
2021 Commitment (in pounds) | lb 25
2019 Commitment (in dollars) | $ $ 24,713
2020 Commitment (in dollars) | $ 18,040
2021 Commitment (in dollars) | $ $ 1,306