CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net loss	$ (4,033)	$ (21,514)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	5,397	6,336
Provision for doubtful accounts	(30)	109
Gain on cancelation of distributor rights agreement	(11)	(40)
Impairment of lasers placed-in-service	194	196
Impairment of intangible assets	0	23
Stock-based compensation	904	186
Deferred taxes	(303)	55
Loss on disposal of property and equipment	407	0
Loss on extinguishment of debentures	0	20,160
Amortization of debt discount	50	944
Amortization of deferred financing costs	107	188
Change in fair value of warrant liability	0	(595)
Change in fair value of embedded conversion feature	0	(3,158)
Changes in operating assets and liabilities:
Accounts receivable	(222)	184
Inventories	215	(193)
Prepaid expenses and other assets	(383)	475
Accounts payable	(513)	381
Other accrued liabilities	1,006	602
Other liabilities	(60)	159
Deferred revenues	171	(358)
Net cash provided by (used in) operating activities	2,896	4,140
Cash Flows From Investing Activities:
Lasers placed-in-service	(1,749)	(1,739)
Purchases of property and equipment	(13)	(320)
Payments on distributor rights liability	(23)	(135)
Net cash used in investing activities	(1,785)	(2,194)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock	17,000	0
Offering costs	(2,336)	0
Repayments of long-term debt	(3,000)	(1,429)
Payments on notes payable	(357)	(374)
Net cash provided by (used in) financing activities	11,307	(1,803)
Effect of exchange rate changes on cash	0	(2)
Net (decrease) increase in cash and cash equivalents	12,418	141
Cash and cash equivalents, beginning of period	4,069	3,928
Cash and cash equivalents, end of period	16,487	4,069
Supplemental information:
Cash paid for interest	1,009	2,215
Cash paid for income taxes	17	28
Supplemental information of non-cash investing and financing activities:
Conversion of senior secured convertible debentures into common stock	0	262
Prepaid insurance financed with notes payable	0	392
Acquisition of distributor rights asset for license liability	0	286
Issuance of convertible preferred stock in exchange for convertible debentures	$ 0	$ 25,910