Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (12,809)	$ (16,912)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	521	2,304
Non-cash interest expense	226	229
Depreciation expense	43	86
Amortization	644	644
Change in warrant valuation	(5)	18
Change in contingent consideration valuation	(3,803)	1,841
Changes in operating assets and liabilities:
Inventory	(210)	205
Prepaid expenses and other assets	(287)	840
Accounts receivable	(66)	(112)
Accounts payable, accrued expenses and other liabilities	2,843	(3,148)
Net cash used in operating activities	(12,903)	(14,005)
Cash flows from investing activities:
Purchase of property and equipment	(20)	(73)
Purchase of short-term investments		(7,495)
Net cash used in investing activities	(20)	(7,568)
Cash flows from financing activities:
Proceeds from public offering, net of transaction costs	9,074	0
Proceeds from registered direct offerings, net of transaction costs	(13)	16,236
Proceeds from warrant exercises		12,155
Payment of contingent consideration	(500)	(6,429)
Payments of withholdings on shares withheld for income taxes	(2)	(41)
Net cash provided by financing activities	8,559	21,921
Net (decrease) increase in cash and cash equivalents	(4,364)	348
Cash and cash equivalents, beginning of period	15,891	30,342
Cash and cash equivalents, end of period	11,527	30,690
Supplemental disclosure of cash flow information:
Offering costs included in accounts payable and accrued expenses	$ 281	$ 38