Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net loss	$ (8,350)	$ (14,645)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	651	2,911
Paid-in-kind interest expense	848	0
Gain on termination of operating lease	(471)	0
Depreciation expense	295	651
Amortization expense	912	637
Change in fair value of warrants	19	0
401(k) employer match in common shares	0	202
Common stock issued for consulting services	0	102
Changes in operating assets and liabilities:
Receivables	278	163
Unbilled receivables	217	(933)
Prepaid expenses and other current assets	836	351
Accounts payable	(258)	789
Deferred revenue	(18)	47
Leases liabilities	(118)	124
Other accrued liabilities	206	(890)
Net cash used in operating activities	(4,953)	(10,491)
Cash flows from investing activities
Purchase of property and equipment	(25)	(255)
Net cash used in investing activities	(25)	(255)
Cash flows from financing activities
Proceeds from Keep Well Notes	8,000	0
Dividends paid	0	(2,239)
Repayments of 2024 Notes	0	(19,994)
Finance lease obligations	(50)	(84)
Financed insurance premium payments	(611)	(750)
Payment of taxes related to net-settled stock awards	0	(2)
Net cash provided by (used in) financing activities	7,339	(23,069)
Net change in cash and restricted cash	2,361	(33,815)
Cash and restricted cash at beginning of period	9,713	65,946
Cash and restricted cash at end of period	12,074	32,131
Supplemental disclosure of cash flow information:
Interest paid	27	1,181
Income taxes refunded, net	(72)	0
Non-cash financing and investing activities:
Warrants issued in connection with Keep Well Notes	10,797	0
Finance lease and accrued purchases of property and equipment	44	187
Common stock issued to settle contingent consideration	$ 0	$ 213