CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net loss	$ (82,227)	$ (15,459)	$ (22,181)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	26,277	23,792	19,876
Stock-based compensation	4,078	3,690	2,425
Interest expense related to amortization of debt discount and debt issuance costs	368	919	375
In-process research and development	0	341	0
Provision for doubtful accounts	404	859	1,094
Provision for excess and obsolete inventory	11,652	6,658	4,564
Litigation settlement	0	0	9,800
Deferred income tax provision (benefit)	816	(3,420)	(4,345)
Other non-cash items	1,464	2,158	0
Changes in operating assets and liabilities:
Accounts receivable	(1,940)	382	(5,004)
Inventories	(4,407)	(7,853)	1,084
Prepaid expenses and other current assets	450	1,681	1,341
Other assets	64	992	1,216
Accounts payable	(3,853)	(1,799)	2,545
Accrued expenses and other	55,171	(1,764)	1,246
Deferred revenue	(510)	416	(628)
Net cash provided by operating activities	7,807	11,593	13,408
Investing activities:
Purchases of property and equipment	(14,352)	(15,646)	(8,206)
Purchase of intangible assets	(750)	(1,750)	(690)
Cash paid for acquisitions	(4,000)	(2,000)	(620)
Net cash used in investing activities	(19,102)	(19,396)	(9,516)
Financing activities:
Exercise of stock options	8	76	104
Borrowings under lines of credit	154,622	121,232	2,350
Repayments under lines of credit	(168,855)	(99,853)	(17,346)
Principal payments on capital lease obligations	(434)	(604)	(143)
Proceeds from issuance of notes payable	28,000	0	10,000
Principal payments on notes payable	(2,654)	(12,375)	(1,880)
Net cash provided by (used in) financing activities	10,687	8,476	(6,915)
Effect of exchange rate changes on cash	(288)	902	521
Net increase (decrease) in cash	(896)	1,575	(2,502)
Cash at beginning of period	22,241	20,666	23,168
Cash at end of period	21,345	22,241	20,666
Supplemental disclosure of cash flow information:
Cash paid for interest	3,973	2,592	2,322
Cash paid for income taxes	1,780	989	523
Purchases of property and equipment in accounts payable	1,513	1,367	3,242
Purchase of property and equipment through capital leases	0	2,225	0
Non-cash purchases of license agreements	250	1,000	8,000
Issuance of common stock in connection with acquisitions	$ 0	$ 8,856	$ 0