Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net loss	$ (35,326)	$ (8,439)	$ (7,764)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	106	100	80
Share-based compensation expense	22,693
Impairment loss on capital projects		506
Changes in operating assets and liabilities:
Prepaid expenses and other currents assets	(1,003)	(785)	(475)
Other assets	349	350	(672)
Accounts payable	(137)	272	39
Accrued expenses and other liabilities	488	806	2,565
Net cash used in operating activities	(12,830)	(7,190)	(6,227)
Investing activities:
Acquisition of property, plant and equipment	(14,833)	(19,392)	(33,213)
Issuance of note receivable	(115)
Repayment of note receivable	115
Cash received in reverse recapitalization	26,774
Investments	(79)	(5,024)
Net cash provided by (used in) investing activities	11,862	(24,416)	(33,213)
Financing activities:
Proceeds from equity issuances	30,100		87,000
Equity issuance costs	(5,953)		(2,746)
Dividends paid			(1,040)
Net cash provided by financing activities	24,147		83,214
Net increase (decrease) in cash, cash equivalents and restricted cash	23,179	(31,606)	43,774
Cash, cash equivalents and restricted cash – beginning of year	12,524	44,130	356
Cash, cash equivalents and restricted cash – end of year	35,703	12,524	44,130
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	498	802	1,200
Accrued liabilities for acquisition of property, plant and equipment	3,317	1,810	1,989
Balances per Consolidated Balance Sheets:
Cash and cash equivalents	$ 35,703	$ 12,524	27,127
Restricted cash			$ 17,003