CONSOLIDATED STATEMENTS OF CASH FLOWS DATA (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Operating Activities:
Cash in transit			$ 2
Issuance of common stock for services rendered to date or to be received in future periods	69	41	3,098
Issuance of common stock for acquired in-process research and development		27,500
Issuance of common stock for 401(k) matching contributions and year-end bonuses	1,361	3,778	972
Reclassification between deposits and other current assets	526	(180)	131
Supplemental Investing Activities:
Net unrealized (loss) gain on available-for-sale securities	(38)	6	306
Supplemental cash flow information
Cash paid for interest		$ 37