Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 153,447	$ 191,471
Accounts receivable, net	26,446	18,398
Inventories	24,820	26,388
Restricted cash	0	63
Prepaid expenses and other current assets	5,333	4,344
Total current assets	210,046	240,664
Property, plant and equipment, net	51,957	52,547
Goodwill	83,828	80,730
Intangible assets, net	32,159	31,833
Other non-current assets	768	731
Total assets	378,758	406,505
Current liabilities:
Accounts payable	11,338	8,675
Accrued payroll and related expenses	6,147	9,627
Current portion of lease obligation	596	585
Current portion of contingent consideration (see Note 9)	1,125	1,286
Deferred grant revenue	1,912	3,658
Other current liabilities	7,025	6,999
Total current liabilities	28,143	30,830
Long-term debt	140,311	143,297
Lease obligation, net of current portion	3,880	4,032
Contingent consideration—non-current (see Note 9)	4,551	4,230
Deferred tax liability—non-current	56	1,970
Income taxes payable	910	910
Deferred rent	2,222	2,296
Other non-current liabilities	$ 282	$ 264
Commitments and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock, $.001 par value per share; 5,000 shares authorized; none issued or outstanding at March 31, 2016 and December 31, 2015	$ 0	$ 0
Common stock, $.001 par value per share; 97,500 shares authorized; 32,323 and 33,323 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	32	33
Additional paid-in capital	192,293	209,121
Accumulated other comprehensive loss	(29)	(31)
Retained earnings	6,107	9,553
Total stockholders’ equity	198,403	218,676
Total liabilities and stockholders’ equity	$ 378,758	$ 406,505