Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net loss	$ (5,702)	$ (14,187)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and other	17,537	20,578
Impairment loss	0	3,558
Stock-based compensation expense	5,713	4,772
Amortization of debt discount and deferred issuance costs	4,232	244
Change in deferred tax assets and liabilities	(6,368)	(9,241)
Change in fair value of acquisition contingencies	0	42
Changes in assets and liabilities:
Accounts receivable	3,441	5,464
Inventories	186	4,115
Income taxes receivable	234	153
Prepaid expenses and other current and non-current assets	(305)	(609)
Restricted cash	1,317	(5,078)
Accounts payable	(1,947)	(780)
Accrued payroll and related expenses	772	406
Income taxes payable	729	119
Deferred grant revenue	(813)	5,884
Other current and non-current liabilities	1,226	2,038
Net cash provided by operating activities	20,252	17,478
INVESTING ACTIVITIES:
Acquisitions of property and equipment	(12,003)	(8,492)
Acquisition of intangibles	0	(92)
Net cash used for investing activities	(12,003)	(8,584)
FINANCING ACTIVITIES:
Payments on lease obligation	(375)	(326)
Repurchases of common stock	(27,617)	(1,956)
Proceeds from issuance of common stock	2,152	4,503
Payments of debt issuance costs	(365)	0
Payments on acquisition contingencies	(129)	(2,112)
Payment for acquisition holdback	(229)	0
Net cash (used for) provided by financing activities	(26,563)	109
Effect of exchange rates on cash	(21)	(26)
Net (decrease) increase in cash and cash equivalents	(18,335)	8,977
Cash and cash equivalents, beginning of period	200,895	8,388
Cash and cash equivalents, end of period	182,560	17,365
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	3,744	725
Cash paid for income taxes	1,920	467
NON-CASH INVESTING ACTIVITIES:
Purchase of capital equipment by incurring current liabilities	1,433	269
NON-CASH FINANCING ACTIVITIES:
Reduction of other current liabilities upon issuance of restricted stock units	$ 408	$ 663