Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of cash flow, supplemental disclosures

The following table presents certain supplementary cash flows information for the years ended December 31, 2018, 2017, and 2016:

	Year Ended December 31,
(In thousands)	2018		2017			2016
Supplementary Cash Flows information:
Non-cash information:
Warrant liabilities settled in common stock	$	3,538	$	—		$	—
Additions to equipment in process included in accounts payable	$	606	$	341		$	18
Shares exchanged between common and preferred stock	$	—	$	(38,389	)	$	(3,150	)
Cash information:
Interest paid (net of interest capitalized)	$	2,230	$	931		$	226
Income tax withholding paid	$	—	$	100		$	—