CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended				12 Months Ended
		Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020
Cash flows from operating activities
Net loss						$ (9,544)		$ (8,183)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation						670		808
Amortization of intangible assets		$ 309		$ 314		622		631
Non-cash operating lease cost						258		269
Provision for expected credit losses						5		33
Write-down of inventory						4
Loss on disposal of property and equipment						120		11
Stock-based compensation expense						3,750		38
Changes in operating assets and liabilities:
Accounts receivable						(691)		751
Prepaid and other current assets						423		203
Inventories						(840)		(5,986)
Accounts payable						326		(68)
Accrued liabilities						(1,236)		(741)
Other						52		495
Net cash used in operating activities						(6,081)		(11,739)
Cash flows from investing activities
Purchase of property and equipment						(134)		(255)
Proceeds from sale of property and equipment								20
Net cash used in investing activities						(134)		(235)
Cash flows from financing activities
Contributions from PDL								1,771
Distributions to PDL								(97)
Proceeds from note payable due to related party								10,400
Proceeds from issuance of common stock under employee stock purchase plan						170
Net cash provided by financing activities						170		12,074
Net decrease in cash, cash equivalents and restricted cash						(6,045)		100
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		$ 34,554	[2]	$ 4,815	[2]	34,554	[2]	4,815	[2]	$ 40,599	[1]
Supplemental cash flow information
Cash paid for interest								478
Cash paid for taxes						19
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net						1,860		1,419
Accounts payable for purchases of Property and equipment						$ 51
Phantom stock liability settled with common stock								$ 783

[1] Includes restricted cash of $100 as of December 31, 2019.

[2] Includes restricted cash of $100 as of June 30, 2020.