Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net loss	$ (3,421,000)	$ (2,866,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	334,000	377,000
Provision for (recovery of) allowance for doubtful accounts	(7,000)	(1,000)
Increase in accrued investment income	(72,000)	(30,000)
Stock-based compensation	1,146,000	290,000
Adjustment to contingent consideration	0	(318,000)
Change in operating assets and liabilities:
Accounts receivable	30,000	322,000
Inventories	(182,000)	285,000
Deferred cost of revenues	(118,000)	(35,000)
Other current assets	(580,000)	435,000
Accounts payable	558,000	(130,000)
Accrued liabilities	332,000	(965,000)
Deferred revenues	315,000	364,000
Deferred rent	(46,000)	93,000
Net cash used in operating activities	(1,711,000)	(2,179,000)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available‑for‑sale short‑term investments	(17,917,000)	(17,972,000)
Proceeds from maturities and sales of available‑for‑sale short‑term investments	18,000,000	23,155,000
Change in other long‑term assets	25,000	(63,000)
Purchase of property and equipment	(72,000)	(84,000)
Net cash provided by investing activities	36,000	5,036,000
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	(237,000)	(42,000)
Net cash used in financing activities	(237,000)	(42,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	71,000	(19,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,841,000)	2,796,000
CASH AND CASH EQUIVALENTS:
Beginning of period	9,803,000	7,691,000
End of period	7,962,000	10,487,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	$ 120,000	$ 128,000