CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net cash used in operating activities	$ (327)	$ (526)
Investing activities
Purchases of marketable securities	(15,911)	(8,627)
Purchases of deposits		(27)
Proceeds from maturity of marketable securities	6,056	5,930
Proceeds from maturity of deposits		3,000
Proceeds from sales of marketable securities	7,937	5,068
Purchases of property and equipment	(446)	(281)
Net cash (used in) provided by investing activities	(2,364)	5,063
Financial activities
Purchase of treasury stock		(3,968)
Issuance of common stock and treasury stock upon exercise of stock options	237
Net cash (used in) provided by financing activities	237	(3,968)
Increase (decrease) in cash and cash equivalents	(2,454)	569
Cash (erosion) due to exchange rate differences	(5)	5
Cash and cash equivalents at the beginning of the period	21,684	18,109
Cash and cash equivalents at the end of the period	$ 19,225	$ 18,683