CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (36,562)	$ (15,571)	$ (24,122)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization, and accretion	14,452	7,255	4,730
Impairment loss	0	0	1,585
Current expected credit losses	540	830	805
Provision for obsolete inventory	2,256	597	845
Stock-based compensation	4,251	2,706	1,039
Loss on debt extinguishment	8,123	0	0
Adjustment to contingent consideration liability	(3,340)	0	(450)
Deferred income tax	(3,229)	(4,002)	13,809
Changes in operating assets and liabilities:
Accounts receivable	(1,532)	(15,640)	3,053
Inventories	(4,476)	1,864	(1,836)
Other current assets	809	(1,004)	958
Other assets	326	436	(197)
Accounts payable	(4,176)	3,741	(1,688)
Accrued salaries and benefits	5,327	1,829	(335)
Accrued expenses	(594)	2,412	(2,939)
Customer deposits and deferred service revenue	(3,445)	1,243	1,349
Other long-term liabilities	1,027	(2,825)	(455)
Net cash used in operating activities	(20,243)	(16,129)	(3,849)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(19,835)	0
Settlement of working capital for acquisition	191	0	0
Capital expenditures	(1,299)	(2,462)	(3,948)
Capitalization of software costs	(7,932)	(4,068)	(3,892)
Proceeds from sale of product line	0	2,482	1,126
Net cash used in provided by investing activities	(9,040)	(23,883)	(6,714)
Cash flows from financing activities:
Payments of long-term debt	(629)	0	(380)
Payment of contingent consideration	0	(2,550)	0
Payments of bank borrowing	0	(17,459)	(50,470)
Proceeds from bank borrowing	0	9,640	57,339
Proceeds from stock issuance, net of issuance costs	131,407	0	0
Payments for the extinguishment of notes payable	(66,250)	0	0
Proceeds from notes payable, net of issuance costs	115,786	75,039	0
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(297)	(544)	0
Proceeds from exercise of stock options	675	1,433	860
Net cash provided by financing activities	180,692	65,559	7,349
Effect of exchange rate changes on cash and cash equivalents	1,241	(996)	99
Net increase (decrease) in cash and cash equivalents	152,650	24,551	(3,115)
Cash and cash equivalents at beginning of period	28,036	3,485	6,600
Cash and cash equivalents at end of period	180,686	28,036	3,485
Supplemental non-cash investing and financing flow information:
Cash paid for interest	4,018	1,293	308
Income taxes, net of refunds	205	(321)	285
Capital expenditures recorded in accounts payable	316	0	0
Capitalized software recorded in accounts payable	228	0	0
Bonus accrual to be paid in common shares	620	833	0
Notes payable for AccSys	0	2,000	0
Common stock to be issued for AccSys	0	27,527	0
Contingent consideration for AccSys	$ 0	$ 3,340	$ 0