Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES:
Net loss	$ (4,940)	$ (8,420)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and other	11,820	13,693
Stock-based compensation expense	3,994	3,479
Amortization of debt discount and deferred issuance costs	2,810	163
Change in deferred tax assets and liabilities	(2,431)	(3,559)
Change in fair value of acquisition contingencies	0	42
Changes in assets and liabilities:
Accounts receivable	18,766	12,688
Inventories	1,072	4,114
Income taxes receivable	(398)	(1,154)
Prepaid expenses and other current and non-current assets	(365)	(476)
Restricted cash	(1,734)	969
Accounts payable	(3,727)	(1,365)
Accrued payroll and related expenses	(631)	(813)
Income taxes payable	(211)	182
Deferred grant revenue	(36)	(1,306)
Other current and non-current liabilities	(727)	(945)
Net cash provided by operating activities	23,262	17,292
INVESTING ACTIVITIES:
Acquisitions of property and equipment	(7,348)	(6,619)
Acquisition of intangibles	0	(92)
Net cash used for investing activities	(7,348)	(6,711)
FINANCING ACTIVITIES:
Payments on lease obligation	(246)	(213)
Repurchases of common stock	(12,133)	(1,951)
Proceeds from issuance of common stock	820	2,376
Payments of debt issuance costs	(365)	0
Payments on acquisition contingencies	(129)	(1,109)
Net cash used for financing activities	(12,053)	(897)
Effect of exchange rates on cash	(21)	3
Net increase in cash and cash equivalents	3,840	9,687
Cash and cash equivalents, beginning of period	200,895	8,388
Cash and cash equivalents, end of period	204,735	18,075
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	3,458	467
Cash paid for income taxes	638	443
NON-CASH INVESTING ACTIVITIES:
Purchase of capital equipment by incurring current liabilities	1,122	452
NON-CASH FINANCING ACTIVITIES:
Reduction of other current liabilities upon issuance of restricted stock units	408	663
Increase of other current liabilities for purchase of common stock	$ 2,660	$ 0