Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 204,735	$ 200,895
Accounts receivable, net	15,694	34,466
Inventories	23,681	24,763
Deferred tax asset—current	7,529	8,316
Restricted cash	4,861	3,127
Prepaid expenses and other current assets	4,111	2,914
Total current assets	260,611	274,481
Property, plant and equipment, net	50,511	49,226
Goodwill	80,732	80,748
Intangible assets, net	36,500	41,890
Other non-current assets	857	1,066
Total assets	429,211	447,411
Current liabilities:
Accounts payable	8,912	12,421
Accrued payroll and related expenses	7,706	8,349
Current portion of lease obligation	643	509
Current portion of contingent consideration (see Note 9)	599	733
Deferred grant revenue	6,294	6,330
Other current liabilities	10,070	8,043
Total current liabilities	34,224	36,385
Long-term debt	140,605	137,958
Lease obligation, net of current portion	4,237	4,617
Contingent consideration—non-current (see Note 9)	5,009	5,023
Deferred tax liability—non-current	11,668	14,890
Income taxes payable	806	806
Deferred rent	2,304	2,228
Other non-current liabilities	$ 245	$ 493
Commitments and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock, $.001 par value per share; 5,000 shares authorized; none issued or outstanding at June 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $.001 par value per share; 97,500 shares authorized; 33,891 and 34,433 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	34	34
Additional paid-in capital	219,402	229,374
Accumulated other comprehensive loss	(15)	(29)
Retained earnings	10,692	15,632
Total stockholders’ equity	230,113	245,011
Total liabilities and stockholders’ equity	$ 429,211	$ 447,411