Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net Loss	$ (38,205,000)	$ (44,840,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash rent expense	0	188,000
Stock based compensation	14,292,000	13,741,000
Depreciation and amortization	122,000	173,000
Impairment loss	98,000	0
Loss on disposal of fixed assets	77,000	0
Amortization of premium on available for sale investments	175,000	442,000
Change in deferred tax liabilities due to acquisition of Novosteo Inc.	(284,000)	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,750,000	(1,851,000)
Other assets	147,000	(106,000)
Accounts payable	(4,664,000)	3,638,000
Accrued expenses and other current liabilities	(5,014,000)	(2,557,000)
Net cash used in operating activities	(31,506,000)	(31,172,000)
Cash flow from investing activities:
Purchase of investments	(36,849,000)	(25,165,000)
Proceeds from maturities of investments	34,388,000	62,568,000
Cash acquired from Novosteo Inc	10,593,000	0
Proceeds from disposal of assets	35,000	0
Purchase of property and equipment	(5,000)	(136,000)
Net cash provided by investing activities	8,162,000	37,267,000
Cash flows from financing activities:
Payments of finance leases	(12,000)	0
Proceeds from issuance of common stock upon exercise of stock options	134,000	1,113,000
Proceeds from issuance of common stock in connection with open market sales agreement, net of issuance costs	608,000	0
Net cash provided by financing activities	730,000	1,113,000
Effect of exchange rate changes on cash	(182,000)	0
Net increase (decrease) in cash and cash equivalents	(22,796,000)	7,208,000
Cash and cash equivalents at beginning of period	69,724,000	66,841,000
Cash and cash equivalents at end of period	46,928,000	74,049,000
Supplemental disclosures of non-cash information:
Net assets acquired of Novosteo Inc. in exchange for common stock	16,210,000	0
Right-of-use assets obtained in exchange for new operating lease liabilities	256,000	1,210,000
Right Of Use Asset And Operating Lease Liability Reduction As A Result Of Lease Modification	$ (640,000)	$ 0