Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (31,400)	$ (7,581)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Stock-based compensation	2,016	1,750
Depreciation and amortization	77	107
Non-cash interest expense	1	8
Amortization of debt issuance costs	0	2
Amortization of operating lease right-of-use assets	523	422
Changes in assets and liabilities:
Accounts receivable	524	8,018
Prepaid expenses, other current assets, and other assets	(2,567)	(1,793)
Accounts payable and accrued liabilities	(483)	(1,838)
Accrued compensation and benefits	(1,324)	(512)
Deferred revenue	(2,252)	3,519
Operating lease liabilities	(559)	(455)
Net cash (used in) provided by operating activities	(35,444)	1,647
Investing activities:
Purchases of property and equipment	(100)	(29)
Net cash used in investing activities	(100)	(29)
Financing activities:
Proceeds from public offering of common stock, net of issuance costs	500	10,748
Proceeds from exercise of stock options	0	6
Principal repayments of Term Loan	(2,222)	(2,222)
Net cash (used in) provided by financing activities	(1,722)	8,532
Net (decrease) increase in cash, cash equivalents, and restricted cash	(37,266)	10,150
Cash, cash equivalents, and restricted cash at beginning of period	62,273	42,949
Cash, cash equivalents, and restricted cash at end of period	25,007	53,099
Supplemental disclosure of cash flows:
Interest paid	38	139
Non-cash investing activities:
Purchases of property and equipment, included in accounts payable and accrued liabilities	0	12
Non-cash financing activities:
Purchase of shares pursuant to Employee Stock Purchase Plan	69	252
Proceeds from public offering of common stock, net of issuance costs, included in prepaid expenses and other current assets	0	66
Issuance costs incurred but not yet paid, included in accounts payable and accrued liabilities	$ 720	$ 0