CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities:
Net loss	$ (2,418)	$ (1,035)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	833	1,038
Amortization of right-of-use assets	86	79
Provision for doubtful accounts	(54)	2
Stock-based compensation	662	430
Deferred taxes	4	88
Changes in operating assets and liabilities:
Accounts receivable	145	1,176
Inventories	132	(444)
Prepaid expenses and other assets	(65)	43
Accounts payable	387	222
Other accrued liabilities	596	16
Other liabilities	(10)	(59)
Operating lease liabilities	(91)	(60)
Deferred revenues	(54)	(898)
Net cash provided by operating activities	153	598
Cash Flows From Investing Activities:
Lasers placed-in-service	(654)	(596)
Purchases of property and equipment	(86)	0
Net cash used in investing activities	(740)	(596)
Net (decrease) increase in cash and cash equivalents and restricted cash	(587)	2
Cash and cash equivalents and restricted cash, beginning of period	18,112	15,629
Cash and cash equivalents and restricted cash, end of period	17,525	15,631
Cash and cash equivalents	10,043	8,150
Restricted cash	7,482	7,481
Supplemental information of cash and non-cash transactions:
Cash paid for interest	$ 30	$ 52