Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 182,560	$ 200,895
Accounts receivable, net	31,020	34,466
Inventories	24,568	24,763
Deferred tax asset—current	7,754	8,316
Restricted cash	1,810	3,127
Prepaid expenses and other current assets	3,371	2,914
Total current assets	251,083	274,481
Property, plant and equipment, net	52,267	49,226
Goodwill	80,733	80,748
Intangible assets, net	34,138	41,890
Other non-current assets	821	1,066
Total assets	419,042	447,411
Current liabilities:
Accounts payable	11,003	12,421
Accrued payroll and related expenses	9,264	8,349
Current portion of lease obligation	710	509
Current portion of contingent consideration (see Note 9)	598	733
Deferred grant revenue	5,517	6,330
Other current liabilities	9,238	8,043
Total current liabilities	36,330	36,385
Long-term debt	141,946	137,958
Lease obligation, net of current portion	4,041	4,617
Contingent consideration—non-current (see Note 9)	5,009	5,023
Deferred tax liability—non-current	7,956	14,890
Income taxes payable	1,746	806
Deferred rent	2,335	2,228
Other non-current liabilities	$ 265	$ 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 September 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $.001 par value per share; 97,500 shares authorized; 33,419 and 34,433 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	33	34
Additional paid-in capital	209,474	229,374
Accumulated other comprehensive loss	(23)	(29)
Retained earnings	9,930	15,632
Total stockholders’ equity	219,414	245,011
Total liabilities and stockholders’ equity	$ 419,042	$ 447,411