CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2018	$ (20,465)		$ 11	$ 3,052	$ (23,528)
Beginning Balance, Shares at Dec. 31, 2018			1,070,000
Contributions from PDL	830			830
Distributions to PDL	(28)			(28)
Settlement of phantom stock-based awards	572			572
Net loss	(2,581)				(2,581)
Ending Balance at Mar. 31, 2019	(21,672)		$ 11	4,426	(26,109)
Ending Balance, Shares at Mar. 31, 2019			1,070,000
Beginning Balance at Dec. 31, 2018	(20,465)		$ 11	3,052	(23,528)
Beginning Balance, Shares at Dec. 31, 2018			1,070,000
Net loss	(12,189)
Ending Balance at Sep. 30, 2019	(29,405)		$ 11	6,301	(35,717)
Ending Balance, Shares at Sep. 30, 2019			1,070,000
Beginning Balance at Mar. 31, 2019	(21,672)		$ 11	4,426	(26,109)
Beginning Balance, Shares at Mar. 31, 2019			1,070,000
Contributions from PDL	1,036			1,036
Distributions to PDL	(24)			(24)
Settlement of phantom stock-based awards	12			12
Net loss	(3,790)				(3,790)
Ending Balance at Jun. 30, 2019	(24,438)		$ 11	5,450	(29,899)
Ending Balance, Shares at Jun. 30, 2019			1,070,000
Contributions from PDL	851			851
Net loss	(5,818)				(5,818)
Ending Balance at Sep. 30, 2019	(29,405)		$ 11	6,301	(35,717)
Ending Balance, Shares at Sep. 30, 2019			1,070,000
Beginning Balance at Dec. 31, 2019	$ (30,553)	$ (34)	$ 11	7,621	(38,185)	$ (34)
Beginning Balance, Shares at Dec. 31, 2019			1,070,000
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Contributions from PDL	$ 1,519			1,519
Distributions to PDL	(97)			(97)
Settlement of phantom stock-based awards	783			783
Net loss	(3,686)				(3,686)
Ending Balance at Mar. 31, 2020	(32,068)		$ 11	9,826	(41,905)
Ending Balance, Shares at Mar. 31, 2020			1,070,000
Beginning Balance at Dec. 31, 2019	$ (30,553)	$ (34)	$ 11	7,621	(38,185)	$ (34)
Beginning Balance, Shares at Dec. 31, 2019			1,070,000
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net loss	$ (12,946)
Ending Balance at Sep. 30, 2020	68,946		$ 106	120,005	(51,165)
Ending Balance, Shares at Sep. 30, 2020			10,634,566
Beginning Balance at Mar. 31, 2020	(32,068)		$ 11	9,826	(41,905)
Beginning Balance, Shares at Mar. 31, 2020			1,070,000
Contributions from PDL	290			290
Net loss	(4,497)				(4,497)
Ending Balance at Jun. 30, 2020	(36,275)		$ 11	10,116	(46,402)
Ending Balance, Shares at Jun. 30, 2020			1,070,000
Impact from recapitalization transactions	69,879		$ 62	69,817
Impact from recapitalization transactions, Shares			6,221,069
Sale of common stock to PDL	16,431		$ 15	16,416
Sale of common stock to PDL, Shares			1,496,210
Capital contribution from PDL	20,666			20,666
Issuance of common stock			$ 18	(18)
Issuance of common stock, Shares			1,847,298
Stock-based compensation under the 2020 Plan	3,857			3,857
Contributions from PDL	609			609
Distributions to PDL	(1,764)			(1,764)
Modification of phantom stock-based awards	306			306
Cancellation of fractional shares due to reverse stock split			(11)
Net loss	(4,763)				(4,763)
Ending Balance at Sep. 30, 2020	$ 68,946		$ 106	$ 120,005	$ (51,165)
Ending Balance, Shares at Sep. 30, 2020			10,634,566