Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (20,340)	$ (32,241)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	858	3,207
Non-cash interest expense	449	458
Depreciation expense	86	149
Amortization	1,288	1,288
Non-cash loss on retirement of fixed assets	8
Gain on extinguishment of debt		(1,553)
Change in warrant valuation	(6)	(41)
Change in contingent consideration valuation	(2,476)	5,722
Changes in operating assets and liabilities:
Inventory	(253)	(580)
Prepaid expenses and other assets	734	1,529
Accounts receivable	(74)	(168)
Accounts payable, accrued expenses and other liabilities	(396)	(1,826)
Net cash used in operating activities	(20,122)	(24,056)
Cash flows from investing activities:
Purchase of property and equipment	(20)	(76)
Purchase of short-term investments		(12,147)
Net cash used in investing activities	(20)	(12,223)
Cash flows from financing activities:
Proceeds from public offering, net of transaction costs	8,925	0
Proceeds from registered direct offerings, net of transaction costs	1,816	27,109
Payments on long-term debt	(278)
Proceeds from warrant exercises		12,155
Payment of contingent consideration	(1,000)	(7,869)
Payments of withholdings on shares withheld for income taxes	(2)	(46)
Net cash provided by financing activities	9,461	31,349
Net (decrease) increase in cash and cash equivalents	(10,681)	(4,930)
Cash and cash equivalents, beginning of period	15,891	30,342
Cash and cash equivalents, end of period	5,210	25,412
Supplemental disclosure of cash flow information:
Offering costs included in accounts payable and accrued expenses	$ 213	$ 7