CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 202,057	$ 26,986
Investments	184,416	186,803
Accounts receivable, net	10,581	6,842
Inventories	21,969	17,217
Receivable from collaboration	230	278
Prepaid and other current assets	4,821	3,396
Restricted cash		2,883
Total current assets	424,074	244,405
Property and equipment, net	1,706	1,846
Intangible assets, net	16,740	16,844
Restricted cash	400	400
Other long-term assets	5,926	1,964
Total assets	448,846	265,459
Current liabilities:
Accounts payable	3,525	2,629
Accrued expenses	24,446	22,266
Deferred revenues	9,222	8,226
Total current liabilities	37,193	33,121
Long-term liabilities:
Convertible 2.5% senior notes, net	164,133
Deferred revenues	38,360	44,534
Acquisition-related contingent consideration	14,160	13,609
Other long-term liabilities	2,014	1,787
Total liabilities	255,860	93,051
Commitments and contingencies
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; 21,956,349 and 21,772,571 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	220	218
Additional paid-in capital	670,934	641,941
Accumulated other comprehensive loss	(3,259)	(3,491)
Accumulated deficit	(474,909)	(466,260)
Total stockholders' equity	192,986	172,408
Total liabilities and stockholders' equity	$ 448,846	$ 265,459