Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net loss	$ (19,682)	$ (4,849)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	77	52
Share-based compensation expense	11,251
Loss on investment securities	25
Changes in operating assets and liabilities:
Prepaid expenses and other currents assets	(96)	114
Accounts payable	(58)	(166)
Accrued expenses and other liabilities	(578)	(204)
Net cash used in operating activities	(9,061)	(5,053)
Investing activities:
Acquisition of property, plant and equipment	(7,746)	(5,584)
Issuance of note receivable		(115)
Repayment of note receivable		5
Investments	(50)	(37)
Net cash used in investing activities	(7,796)	(5,731)
Financing activities:
Proceeds from equity issuance		15,000
Equity issuance costs		(2,567)
Net cash provided by financing activities		12,433
Net (decrease) increase in cash and cash equivalents	(16,857)	1,649
Cash and cash equivalents – beginning of period	35,703	12,524
Cash and cash equivalents – end of period	18,846	14,173
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	453	1,543
Accrued liabilities for acquisition of property, plant and equipment	$ 6,930	3,303
Accrued liability for deferred financing cost		$ 1,079