CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - 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) income	$ (55,512)	$ 41,564
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	30	31
Share-based compensation	958	407
Change in fair value of contingent consideration	48,160	(53,700)
Changes in operating assets and liabilities:
Accounts receivable (net)	(2,886)	0
Prepaid expenses and other assets	(6,159)	4,011
Accounts payable	(1,098)	166
Accrued expenses and other liabilities	(468)	(1,317)
Deferred revenue (ST and LT)	(1,500)	0
Net Cash Used in Operating Activities	(18,475)	(8,838)	$ (30,800)
Cash Flows from Investing Activities:
Net Cash Used in Investing Activities	0	0
Cash Flows from Financing Activities:
Proceeds from issuance of common stock under ATM Offering, net of issuance costs	72,543	3,179
Proceeds from sales of common stock under 2014 ESPP	0	1
Proceeds from exercises of stock options	39	0
Proceeds from the exercise of common stock warrants	469	0
Net Cash Provided by Financing Activities	73,051	3,180
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	54,576	(5,658)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	55,409	48,141	48,141
Cash, Cash Equivalents and Restricted Cash - End of Period	109,985	42,483	$ 55,409
Supplemental disclosure of non-cash activities
Cash paid for amounts included in the measurement of lease liabilities	$ 43	$ 38