Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net loss	$ (19,128)	$ (17,340)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation	869	802
Amortization of intangible assets	2,670	2,867
Amortization of discounts and premiums on investments, net	215	0
Stock-based compensation	2,245	1,786
Deferred tax expense (benefit)	84	(38)
Bad debt expense	177	0
Change in inventory reserves	(180)	122
Change in fair value of warrant liabilities	(0)	1,981
Change in fair value of contingent consideration	(154)	257
Changes in operating assets and liabilities:
Accounts receivable	25	(1,608)
Inventories	(1,440)	(162)
Operating lease right-of-use assets	197	(3,071)
Prepaid expenses	201	295
Other current and long-term assets	(487)	2,755
Accounts payable	74	242
Accrued expenses	(1,150)	(2,312)
Deferred revenue	(1)	128
Operating lease liabilities	(160)	3,059
Net cash and cash equivalents used in operating activities	(15,943)	(10,237)
Investing Activities:
Purchase of available-for-sale investments	(5,967)	0
Proceeds from maturities of available-for-sale investments	29,258	0
Purchase of property and equipment	(246)	(395)
Net cash and cash equivalents provided by (used in) investing activities	23,045	(395)
Financing Activities:
Proceeds from issuance of common stock, net of issuance costs	0	129,322
Taxes paid related to net share settlement of vesting of restricted stock units	(348)	(214)
Proceeds from exercise of stock options and warrants	12	30,497
Net cash and cash equivalents (used in) provided by financing activities	(336)	159,605
Effect of exchange rate changes on cash and cash equivalents	(45)	(108)
Net increase in cash, cash equivalents and restricted cash	6,721	148,865
Cash, cash equivalents and restricted cash, beginning of period	19,283	17,529
Cash, cash equivalents and restricted cash, end of period	26,004	166,394
Supplemental Disclosure for Cash Flow Information
Cash paid for leases	300	365
Cash paid for taxes	29	24
Supplemental Schedule of Non-cash Investing and Financing Activities:
Transfer of inventories to property and equipment	160	0
Acquisition of property and equipment in accounts payable	0	191
Reclass of warrant liability to common stock and additional paid-in-capital	0	2,236
Lease liabilities arising from obtaining right-of-use assets	$ 0	$ 3,427