Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Net loss	$ (2,569,000)	$ (1,638,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	220,000	261,000
Reduction in allowance for doubtful accounts	(7,000)	2,000
Increase in accrued investment income	(40,000)	(20,000)
Stock-based compensation	909,000	176,000
Adjustment to contingent consideration	0	(318,000)
Change in operating assets and liabilities:
Accounts receivable	(668,000)	364,000
Inventories	(66,000)	79,000
Deferred cost of revenues	(111,000)	(230,000)
Other current assets	(398,000)	219,000
Accounts payable	544,000	(791,000)
Accrued liabilities	(111,000)	(1,022,000)
Deferred revenues	226,000	1,038,000
Deferred rent	(32,000)	99,000
Net cash used in operating activities	(2,103,000)	(1,781,000)
CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES:
Purchases of available‑for‑sale short‑term investments	(11,950,000)	(7,988,000)
Proceeds from maturities and sales of available‑for‑sale short‑term investments	12,000,000	13,000,000
Change in other long‑term assets	24,000	0
Capital expenditures	(31,000)	(67,000)
Net cash provided by investing activities	43,000	4,945,000
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	(64,000)	(32,000)
Net cash used in financing activities	(64,000)	(32,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	48,000	(16,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,076,000)	3,116,000
CASH AND CASH EQUIVALENTS:
Beginning of period	9,803,000	7,691,000
End of period	7,727,000	10,807,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	$ 68,000	$ 85,000