CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net loss	$ (1,286)	$ (4,312)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	185	141
Amortization of premiums and discounts on investments	32	103
Amortization of intangible assets and other	10	267
Stock-based compensation	90	661
Changes in assets and liabilities:
Accounts receivable, net	(657)	(447)
Prepaid expenses and other current assets	234	(297)
Other long-term assets	11	(21)
Accounts payable	(63)	1,365
Accrued compensation	(1,008)	(184)
Other accrued liabilities	(376)	(1,313)
Other long-term liabilities	15	(293)
Deferred revenue	99	160
Net cash used in operating activities	(2,714)	(4,170)
Investing Activities:
Purchases of property and equipment	(31)	(300)
Purchases of investments	(5,173)	(9,414)
Maturities of investments	12,733	8,910
Net cash provided by (used in) investing activities	7,529	(804)
Financing Activities:
Repurchase of common stock	0	(31)
Net cash used in financing activities	0	(31)
Effect of exchange rate changes on cash and cash equivalents	118	61
Net increase (decrease) in cash and cash equivalents	4,933	(4,944)
Cash and cash equivalents at beginning of period	16,890	27,598
Cash and cash equivalents at end of period	21,823	22,654
Supplemental schedule of cash flow information:
Income taxes paid	$ 36	$ 66