Supplemental Cash Flow Information (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	Three months ended March 31,
	2021			2020
	(in thousands)
Cash paid for interest	$	—		$	306
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(321	)	$	(404	)
Operating cash flows from finance leases	$	(1	)	$	(9	)

	Years Ended December 31,
	2020			2019
	(in thousands)
Cash paid for interest	$	(144	)	$	(53	)
Cash paid for taxes	$	-		$	-
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	(1,446	)	$	(1,255	)
Operating cash flows from finance leases	$	(29	)	$	(50	)
Right-of-use assets obtained in exchange for lease obligations	$	1,007		$	21

Schedule of provides supplemental disclosures of noncash financing activities

	Years Ended December 31,
	2020			2019
	(in thousands)
Warrants exercised where proceeds are included within prepaid expenses and other current assets	$	11,978		$	-
Settlement of convertible notes payable and convertible note payable derivative liabilities	$	44,039		$	-
Redemption of unexercised warrants included within prepaid expenses and other current assets	$	(3	)	$	-