CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 30,028	$ 25,554
Marketable securities	95,129	89,699
Income tax receivable		40
Prepaid expenses and other current assets	1,496	1,330
Total current assets	126,653	116,623
Marketable securities, non-current	3,465	5,124
Property, plant and equipment, net	3,857	3,932
Goodwill	731	731
Restricted cash		2,134
Other assets	554	554
Total assets	135,260	129,098
Current liabilities:
Accounts payable	2,181	1,198
Accrued compensation	2,663	3,556
Other accrued liabilities	679	773
Deferred revenue	509	509
Deferred rent	14	12
Total current liabilities	6,046	6,048
Deferred rent, non-current	21	9
Deferred revenue, non-current	1,175	1,429
Total liabilities	7,242	7,486
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value; 2,000,000 shares authorized; none outstanding
Common stock, $.001 par value; 150,000,000 shares authorized; 60,425,525 and 60,357,593 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	60	60
Additional paid in capital	461,091	459,482
Accumulated other comprehensive income	786	2,382
Accumulated deficit	(333,919)	(340,312)
Total stockholders' equity	128,018	121,612
Total liabilities and stockholders' equity	$ 135,260	$ 129,098