Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net loss	$ (317)	$ (858)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	711	674
Intangible asset amortization	240	290
Stock-based compensation	882	668
Loss on disposal of property and equipment	0	10
Restructuring costs	(3)	(11)
Bad debt provision	7	15
Deferred tax provision	0	(236)
Changes in operating assets and liabilities:
Accounts receivable	(512)	(350)
Inventories	38	321
Prepaid expenses and other assets	23	(250)
Accounts payable	554	(64)
Income taxes payable	(22)	(3)
Other accrued liabilities	(39)	(1,808)
Deferred revenue	(23)	14
Net cash provided by (used in) operating activities	1,539	(1,588)
Investing Activities:
Capital expenditures	(311)	(884)
Proceeds from disposal of property and equipment	0	14
Purchases of investments	(13,893)	(7,266)
Redemptions/maturities of short-term investments	14,177	17,480
Net cash (used in) provided by investing activities	(27)	9,344
Financing Activities:
Proceeds from issuance of common stock	338	364
Payment of withholding tax on stock-based compensation	(743)	(289)
Principle payments on finance leases	(26)	(24)
Cash dividends	(1,016)	(995)
Net cash used in financing activities	(1,447)	(944)
Net increase in cash and cash equivalents	65	6,812
Effect of exchange rate changes on cash	61	81
Cash and cash equivalents, beginning of period	4,329	5,559
Cash and Cash Equivalents, End of Period	$ 4,455	$ 12,452