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Stockholders' Equity - TotalEnergies Private Placement (Details) - Purchase Agreement - USD ($) $ / shares in Units, $ in Millions	Jun. 13, 2018	May 09, 2018
Stockholders' equity
Number of shares issued in transaction (in shares)	50,856,296	50,856,296
Price per share (in dollars per share)		$ 1.64
Percentage of ownership after transaction	25.00%
Consideration received on transaction	$ 83.4
Fees and issuance costs	$ 1.9
Purchase Percentage Covenant, Threshold
Stockholders' equity
Percentage of ownership after transaction		5.00%
Purchase Percentage Covenant, Maximum
Stockholders' equity
Percentage of ownership after transaction		30.00%

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