CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended				12 Months Ended
		Mar. 31, 2021		Mar. 31, 2020		Dec. 31, 2020
Cash flows from operating activities
Net loss		$ (5,182)		$ (3,686)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation		328		477
Amortization of intangible assets		313		317
Non-cash operating lease cost		129		135
Provision for expected credit losses				15
Write-down of inventory		4
Loss (Gain) on disposal of property and equipment		120		(5)
Stock-based compensation expense		2,320		38
Changes in operating assets and liabilities:
Accounts receivable		(95)		639
Prepaid and other current assets		33		180
Inventories		12		(3,896)
Accounts payable		(778)		680
Accrued liabilities		(1,828)		(1,626)
Other		5		368
Net cash used in operating activities		(4,619)		(6,364)
Cash flows from investing activities
Purchase of property and equipment		(114)		(103)
Proceeds from sale of property and equipment				10
Net cash used in investing activities		(114)		(93)
Cash flows from financing activities
Contributions from PDL				1,481
Distributions to PDL				(97)
Proceeds from note payable due to related party				3,000
Net cash provided by financing activities				4,384
Net decrease in cash, cash equivalents and restricted cash		(4,733)		(2,073)
Cash, cash equivalents and restricted cash at beginning of the period	[1]	40,599		4,715		$ 4,715
Cash, cash equivalents and restricted cash at end the period		35,866	[2]	2,642	[2]	$ 40,599	[1]
Supplemental cash flow information
Cash paid for interest				205
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net		$ 435		1,419
Phantom stock liability settled with common stock				$ 783

[1] Includes restricted cash of zero and $100 as of December 31, 2020 and 2019, respectively.

[2] Includes restricted cash of zero and $100 as of March 31, 2021 and 2020, respectively.