Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net loss	$ (16,200)	$ (2,388)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	29	26
Share-based compensation expense	12,234
Loss on investment securities	22
Changes in operating assets and liabilities:
Prepaid expenses and other currents assets	(183)	(1,351)
Accounts payable	(156)	235
Accrued expenses and other liabilities	(1,543)	161
Net cash used in operating activities	(5,797)	(3,317)
Investing activities:
Acquisition of property, plant and equipment	(5,177)	(3,382)
Issuance of note receivable		(115)
Investments	(24)	(16)
Net cash used in investing activities	(5,201)	(3,513)
Financing activities:
Proceeds from equity issuances		100
Net cash provided by financing activities		100
Net decrease in cash and cash equivalents	(10,998)	(6,730)
Cash and cash equivalents – beginning of year	35,703	12,524
Cash and cash equivalents – end of year	24,705	5,794
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	175	352
Accrued liabilities for acquisition of property, plant and equipment	$ 4,471	3,182
Accrued liability for deferred financing cost		$ 891