CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (15,650)	$ (8,271)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	6,400	2,810
Accretion of debt in interest expense	486	1,180
Current expected credit losses	326	18
Provision for obsolete inventory	529	210
Stock-based compensation	3,536	1,320
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(4,868)	4,267
Inventories	(6,338)	(3,850)
Other current assets	(1,849)	(4,343)
Other assets	(1,353)	421
Accounts payable	1,906	5,658
Accrued salaries and benefits	(4,511)	(3,916)
Accrued expenses	(1,117)	1,332
Customer deposits and deferred service revenue	1,651	143
Other long-term liabilities	(346)	(413)
Net cash used in operating activities	(21,198)	(3,434)
Cash flows from investing activities:
Cash paid for acquisition	(1,212)	0
Capital expenditures	(280)	(152)
Capitalization of software costs	(1,568)	(1,517)
Net cash used in investing activities	(3,060)	(1,669)
Cash flows from financing activities:
Principal payments of long-term debt	(173)	(163)
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(2,051)	(2,362)
Proceeds from exercise of stock options	813	409
Net cash used in financing activities	(1,411)	(2,116)
Effect of exchange rate changes on cash and cash equivalents	457	(345)
Net decrease in cash and cash equivalents	(25,212)	(7,564)
Cash and cash equivalents at beginning of period	188,419	180,686
Cash and equivalents at end of period	163,207	173,122
Supplemental disclosures of cash flow information:
Interest	9	19
Capitalized software recorded in accounts payable	13	317
Capital expenditures in accounts payable	$ 73	$ 122