Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net loss	$ (1,199,000)	$ (875,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	110,000	144,000
Reduction in allowance for doubtful accounts	(7,000)	0
Increase in accrued investment income	(16,000)	(11,000)
Stock-based compensation	467,000	(1,000)
Adjustment to contingent consideration	0	(318,000)
Change in operating assets and liabilities:
Accounts receivable	(96,000)	(189,000)
Inventories	54,000	(433,000)
Deferred cost of revenues	(125,000)	40,000
Other current assets	(124,000)	41,000
Accounts payable	42,000	113,000
Accrued liabilities	(545,000)	(904,000)
Deferred revenues	(39,000)	(131,000)
Deferred rent	(18,000)	109,000
Net cash used in operating activities	(1,496,000)	(2,415,000)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available‑for‑sale short‑term investments	(5,979,000)	(3,992,000)
Proceeds from maturities and sales of available‑for‑sale short‑term investments	6,000,000	4,000,000
Change in other long‑term assets	11,000	0
Capital expenditures	(16,000)	(5,000)
Net cash provided by investing activities	16,000	3,000
CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES:
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units and upon exercise of stock options	(17,000)	(1,000)
Net cash used in financing activities	(17,000)	(1,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	19,000	10,000
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,478,000)	(2,403,000)
CASH AND CASH EQUIVALENTS:
Beginning of period	9,803,000	7,691,000
End of period	8,325,000	5,288,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	$ 37,000	$ 53,000