Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 26,986	$ 46,293
Investments	186,803	180,750
Accounts receivable, net	6,842	6,410
Inventories	17,217	12,451
Receivable from collaboration	278	263
Assets held for sale		2,000
Prepaid and other current assets	3,396	6,213
Restricted cash	2,883
Total current assets	244,405	254,380
Property and equipment, net	1,846	3,297
Intangible assets, net	16,844
Restricted cash	400	460
Other long-term assets	1,964
Total assets	265,459	258,137
Current liabilities:
Accounts payable	2,629	3,515
Accrued expenses	22,266	20,338
Deferred revenues	8,226	9,104
Total current liabilities	33,121	32,957
Long-term liabilities:
Deferred revenues	44,534	50,350
Acquisition-related contingent consideration, net of current portion	13,609
Other long-term liabilities	1,787	2,033
Total liabilities	93,051	85,340
Commitments and contingencies (Notes G, P & Q)
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; 21,772,571 and 21,506,754 shares issued and outstanding at December 31, 2013 and 2012, respectively	218	215
Additional paid-in capital	641,941	632,487
Accumulated other comprehensive loss	(3,491)	(3,247)
Accumulated deficit	(466,260)	(456,658)
Total stockholders' equity	172,408	172,797
Total liabilities and stockholders' equity	$ 265,459	$ 258,137