CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,102	$ 5,954
Adjustments to reconcile net income to net cash (used in) operating activities:
Depreciation	1,094	537
Non-cash reserve (recoveries)	(35)	(310)
Stock-based compensation	509	1,076
Non-cash lease expense	414	8
Provision for deferred income taxes	126	110
Change in operating assets and liabilities:
Accounts receivable	(4,473)	(1,431)
Prepaid and other assets	191	(489)
Accounts payable and other accrued expenses	(1,570)	189
Inventory	(2,398)	(2,408)
Deposits	(238)	47
Net cash (used in)/ provided by operating activities	(4,278)	3,283
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(354)	(654)
Net cash (used in) investing activities	(354)	(654)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on finance lease obligations	(44)	(27)
Purchase of treasury stock	(2,120)	0
Proceeds from the issuance of common stock on stock-based compensation awards	89	274
Taxes withheld and paid on employees' equity awards	(136)	0
Net cash (used in)/provided by financing activities	(2,211)	247
Net (decrease)/ increase in cash	(6,843)	2,876
Cash at beginning of period	39,173	14,040
Cash at end of period	32,330	16,916
Supplemental disclosure of cash flow information:
Cash paid for interest	(54)	(9)
Cash paid for rent	(1,069)	(779)
Cash paid for income taxes	(335)	(660)
Supplemental disclosure of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	13,247	1,433
Right-of-use assets obtained in exchange for new finance lease liabilities	162	72
Inventory transferred to property and equipment under lease	967	343
Inventory transferred to property and equipment as demo devices	$ 114	$ 0