Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (2,195,000)	$ (7,087,000)
Adjustments to reconcile net loss to cash used in operating activities:
Bad debt expense (recovery)	(103,000)	350,000
Stock-based compensation expense	1,027,000	767,000
Depreciation and amortization	354,000	394,000
Inventory reserve	120,000	154,000
Other non-cash items	36,000	20,000
Changes in:
Accounts receivable	797,000	1,809,000
Financing receivables	72,000	609,000
Inventory	1,629,000	(2,638,000)
Prepaid expenses and other assets	(127,000)	(226,000)
Deferred costs	(1,446,000)	(243,000)
Deferred revenue	1,232,000	(752,000)
Accounts payable and accrued expenses	(1,413,000)	(212,000)
Net cash used in operating activities	(17,000)	(7,055,000)
Cash flows from investing activities:
Expenditures for fixed assets including website development costs	(278,000)	(1,477,000)
Purchase of investments	(377,000)	(2,064,000)
Proceeds from the sale and maturities of investments	371,000	6,110,000
Net cash provided by (used in) investing activities	(284,000)	2,569,000
Cash flows from financing activities:
Principal payments of capital lease obligation		(79,000)
Proceeds from exercise of stock options	19,000	1,896,000
Net cash provided by financing activities	19,000	1,817,000
Effect of foreign exchange rate changes on cash and cash equivalents	24,000	38,000
Net decrease in cash and cash equivalents	(258,000)	(2,631,000)
Cash and cash equivalents - beginning of period	4,489,000	5,974,000
Cash and cash equivalents - end of period	4,231,000	3,343,000
Cash paid for:
Taxes
Interest	85,000	9,000
Noncash activities:
Unrealized gain on investments	4,000	12,000
Shares withheld pursuant to stock issuance	$ 163,000	$ 351,000