Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (19,367)	$ (20,524)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,461	9,512
Stock-based compensation expense	3,624	2,675
Deferred taxes	77	(6)
Investment-related amortization and accrued interest	195	669
Loss on disposal of property and equipment	133	109
Allowance for doubtful accounts	13	(144)
Write-down of inventories	1,595	849
Other, net	191	356
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(15,298)	(1,766)
Inventories	(1,517)	(1,577)
Prepaid expenses and other assets	(3,785)	47
Accounts payable	5,825	2,308
Acquisition-related transaction costs		3,282
Accrued and other liabilities	(3,454)	104
Net cash used in operating activities	(20,307)	(4,106)
Cash flows from investing activities
Purchase of property, plant and equipment	(5,907)	(10,453)
Purchase of marketable securities	(9,653)	(48,771)
Proceeds from sale of marketable securities	9,634	35,247
Proceeds from maturity of securities	9,448	40,255
(Increase) decrease in restricted cash	(16,018)	859
Acquisition, net of notes payable		(14,979)
Net cash (used in) provided by investing activities	(12,496)	2,158
Cash flows from financing activities
Proceeds from exercise of stock options	739	652
Proceeds from issuance of stock under ESPP	1,247	1,162
Tax withholding on restricted stock units	(86)	(80)
Payment of acquisition-related contingent consideration	(1,985)
Proceeds from bank loans	8,098	26,443
Repayment of bank loans	(6,918)	(22,360)
Proceeds from issuance of notes payable	12,319	9,471
Repayment of notes payable	(9,787)	(12,661)
Net cash provided by financing activities	3,627	2,627
Effect of exchange rates on cash and cash equivalents	118	(61)
Net (decrease) increase in cash and cash equivalents	(29,058)	618
Cash and cash equivalents at the beginning of the period	57,101	36,940
Cash and cash equivalents at the end of the period	28,043	37,558
Supplemental disclosure of noncash investing and financing activities:
Transfer of short-term investments to restricted investments	8,296
Changes in accounts payable and accrued liabilities related to property, plant and equipment	776	(743)
Issuance of notes to the seller of acquired business		$ 11,130