CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 200,916	$ 26,986
Investments	184,557	186,803
Accounts receivable, net	10,115	6,842
Inventories	20,804	17,217
Receivable from collaboration	202	278
Prepaid and other current assets	4,410	3,396
Restricted cash		2,883
Total current assets	421,004	244,405
Property and equipment, net	1,837	1,846
Intangible assets, net	16,815	16,844
Restricted cash	400	400
Other long-term assets	6,407	1,964
Total assets	446,463	265,459
Current liabilities:
Accounts payable	5,125	2,629
Accrued expenses	21,851	22,266
Deferred revenues	9,118	8,226
Total current liabilities	36,094	33,121
Long-term liabilities:
Convertible 2.5% senior notes, net	162,561
Deferred revenues	40,567	44,534
Acquisition-related contingent consideration	14,040	13,609
Other long-term liabilities	2,105	1,787
Total liabilities	255,367	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; 21,877,192 and 21,772,571 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	219	218
Additional paid-in capital	667,653	641,941
Accumulated other comprehensive loss	(3,414)	(3,491)
Accumulated deficit	(473,362)	(466,260)
Total stockholders' equity	191,096	172,408
Total liabilities and stockholders' equity	$ 446,463	$ 265,459