CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (8,271)	$ (10,910)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation, amortization and accretion	3,990	3,142
Current expected credit losses	18	244
Provision for obsolete inventory	210	1,188
Stock-based compensation	1,320	1,089
Loss on debt extinguishment	0	8,123
Deferred income tax	0	(5,386)
Changes in operating assets and liabilities:
Accounts receivable	4,267	(1,289)
Inventories	(3,850)	(5,201)
Other current assets	(4,343)	(2,764)
Other assets	421	85
Accounts payable	5,658	218
Accrued salaries and benefits	(3,916)	(1,646)
Accrued expenses	1,332	(283)
Customer deposits and deferred service revenue	143	(1,733)
Other long-term liabilities	(413)	0
Net cash used in operating activities	(3,434)	(15,123)
Cash flows from investing activities:
Capital expenditures	(152)	(188)
Capitalization of software costs	(1,517)	(1,852)
Net cash used in investing activities	(1,669)	(2,040)
Cash flows from financing activities:
Payments of long-term debt	(163)	(154)
Payments for the extinguishment of notes payable	0	(66,250)
Proceeds from notes payable, net of issuance costs	0	115,916
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(2,362)	(153)
Proceeds from exercise of stock options	409	30
Net cash (used in) provided by financing activities	(2,116)	49,389
Effect of exchange rate changes on cash and cash equivalents	(345)	(173)
Net (decrease) increase in operating activities	(7,564)	32,053
Cash and cash equivalents at beginning of period	180,686	28,036
Cash and equivalents at end of period	173,122	60,089
Supplemental non-cash investing and financing flow information:
Cash paid for interest	19	953
Income taxes, net of refunds	5	0
Capitalized software recorded in accounts payable	317	0
Capital expenditures in accounts payable	$ 122	$ 0