UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (3,161,000)	$ (10,506,000)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	335,000	174,000
Equity-based compensation	985,000	928,000
Amortization of long-term debt issuance costs and fees	35,000	86,000
Other	356,000	36,000
Change in fair value of warrant liabilities	(157,000)	(256,000)
Changes in operating assets and liabilities:
Unbilled revenue receivable and accounts receivable	11,000	3,000
Prepaid expenses and other current assets	(1,551,000)	(257,000)
Other noncurrent assets	(1,034,000)	112,000
Accounts payable	22,000	403,000
Accrued expenses and other current liabilities	(647,000)	(66,000)
Deferred revenue	(13,949,000)	541,000
Other noncurrent liabilities	(59,000)	(194,000)
Net cash used in operating activities	(18,814,000)	(8,996,000)
Cash flows from investing activities:
Purchase of available for sale securities	(38,072,000)	0
Proceeds from sale or maturity of available for sale securities	32,103,000	0
Capital expenditures	(2,996,000)	(62,000)
Net cash used in investing activities	(8,965,000)	(62,000)
Cash flows from financing activities:
Proceeds from common stock offering	2,973,000	0
Proceeds from exercise of common stock options	50,000	17,000
Repayment of long-term debt	4,999,000	0
Payment of long-term debt fees and issuance costs	(100,000)	(52,000)
Payment of common stock financing costs	(207,000)	0
Net cash used in financing activities	(2,283,000)	(35,000)
Net decrease in cash, cash equivalents, and restricted cash	(30,062,000)	(9,093,000)
Cash, cash equivalents, and restricted cash - beginning of period	48,460,000	26,268,000
Cash, cash equivalents, and restricted cash - end of period	18,398,000	17,175,000
Non-cash financing activities:
Debt fees (accrued expenses)	0	100,000
Non-cash investing activities:
Capital expenditures (accounts payable and accrued expenses)	60,000	14,000
Total cash, cash equivalents, and restricted cash shown in the unaudited condensed consolidated statements of cash flows	$ 18,398,000	$ 17,175,000