CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 27,802	$ 46,293
Investments	184,611	180,750
Accounts receivable, net	8,490	6,410
Inventories	13,474	12,451
Receivable from collaboration	368	263
Assets held for sale	1,934	2,000
Prepaid and other current assets	5,658	6,213
Restricted cash	460	460
Total current assets	242,797	254,840
Property and equipment, net	1,913	3,297
Intangible assets, net	17,192
Restricted cash	400
Total assets	262,302	258,137
Current liabilities:
Accounts payable	2,443	3,515
Accrued expenses	18,256	20,338
Deferred revenues	9,269	9,104
Total current liabilities	29,968	32,957
Long-term liabilities:
Deferred revenues	46,402	50,350
Acquisition-related contingent consideration, net of current portion	13,044
Other long-term liabilities	1,806	2,033
Total liabilities	91,220	85,340
Commitments and contingencies (Notes M & N)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 2,000,000 shares authorized; none issued
Common stock, par value $0.01 per share, 58,750,000 shares authorized; 21,652,941 and 21,506,754 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	217	215
Additional paid-in capital	637,261	632,487
Accumulated other comprehensive loss	(3,935)	(3,247)
Accumulated deficit	(462,461)	(456,658)
Total stockholders' equity	171,082	172,797
Total liabilities and stockholders' equity	$ 262,302	$ 258,137