Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES:
Net (loss) income	$ (14,187)	$ 6,251
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and other	20,578	18,457
Impairment loss	3,558	0
Stock-based compensation expense	4,772	5,447
Change in deferred tax assets and liabilities	(9,241)	3,450
Excess tax benefit from share-based compensation		(937)
Change in fair value of acquisition contingencies	42
Changes in assets and liabilities:
Accounts receivable	5,464	13,200
Inventories	4,115	(11,700)
Income taxes receivable	153	(4,878)
Prepaid expenses and other current and non-current assets	(365)	270
Restricted cash	(5,078)	2,156
Accounts payable	(780)	(842)
Accrued payroll and related expenses	406	636
Income taxes payable	119	(3,435)
Deferred grant revenue	5,884	(1,936)
Other current and non-current liabilities	2,038	(1,921)
Net cash provided by operating activities	17,478	24,218
INVESTING ACTIVITIES:
Acquisitions of property and equipment	(8,492)	(16,942)
Acquisition of BioHelix, net of cash acquired	0	(9,184)
Acquisition of AnDiaTec	0	(2,271)
Acquisition of intangibles	(92)	(1,363)
Net cash used for investing activities	(8,584)	(29,760)
FINANCING ACTIVITIES:
Payments on lease obligation	(326)	(280)
Repurchases of common stock	(1,956)	(991)
Proceeds from issuance of common stock	4,503	6,268
Excess tax benefit from share-based compensation	0	937
Payment on line of credit	0	(5,000)
Payments on acquisition contingencies	(2,112)
Net cash provided by financing activities	109	934
Effect of exchange rates on cash	(26)	0
Net increase (decrease) in cash and cash equivalents	8,977	(4,608)
Cash and cash equivalents, beginning of period	8,388	14,856
Cash and cash equivalents, end of period	17,365	10,248
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	725	825
Cash paid for income taxes	467	1,900
NON-CASH INVESTING ACTIVITIES:
Purchase of capital equipment by incurring current liabilities	269	767
NON-CASH FINANCING ACTIVITIES:
Reduction of other current liabilities upon issuance of restricted share units	$ 663	$ 456