Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Supplementary cash flows information

The following table presents certain supplementary cash flows information for the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31,
(In thousands)	2019		2018		2017
Supplementary Cash Flows information:
Non-cash information:
Warrants exercised for common stock	$	104	$	3,538	$	—
Right-of-use asset and lease liability recognized	2,599		—		—
Additions to equipment in process included in accounts payable	217		606		341
Shares exchanged between common and preferred stock	—		—		(38,389		)
Cash information:
Interest paid (net of interest capitalized)	$	—	$	2,230	$	931
Income tax withholding paid	—		—		100