Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Basis of Presentation [Abstract]

Schedule of cash flow, supplemental disclosures

The following table presents certain supplementary cash flows information for three months endedMarch 31, 2018 and 2017:

	Three Months Ended March 31,
(In thousands)	2018			2017
Supplementary Cash Flows information:
Warrants exchanged for common stock	$	2,000		$	—
Interest paid (net of interest capitalized)	357		226	221
Additions to equipment in process included in accounts payable	401			102