CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 30,946	$ 46,293
Investments	182,595	180,750
Accounts receivable, net	8,778	6,410
Inventories	14,694	12,451
Receivable from collaboration	250	263
Assets held for sale	1,934	2,000
Prepaid and other current assets	5,900	6,213
Restricted cash	460
Total current assets	245,557	254,380
Property and equipment, net	1,741	3,297
Intangible assets, net	16,866
Restricted cash	400	460
Total assets	264,564	258,137
Current liabilities:
Accounts payable	1,001	3,515
Accrued expenses	20,032	20,338
Deferred revenues	10,027	9,104
Total current liabilities	31,060	32,957
Long-term liabilities:
Deferred revenues	44,428	50,350
Acquisition-related contingent consideration, net of current portion	13,097
Other long-term liabilities	1,728	2,033
Total liabilities	90,313	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; 21,735,707 and 21,506,754 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	217	215
Additional paid-in capital	640,176	632,487
Accumulated other comprehensive loss	(3,536)	(3,247)
Accumulated deficit	(462,606)	(456,658)
Total stockholders' equity	174,251	172,797
Total liabilities and stockholders' equity	$ 264,564	$ 258,137