CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ (23,342,000)	$ 111,951,000	$ 10,334,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	35,646,000	23,868,000	19,745,000
Deferred income taxes	(1,240,000)	(3,454,000)	(228,000)
Share-based compensation	45,138,000	35,019,000	21,412,000
Gain on investments	(1,219,000)	(896,000)	(15,000)
Excess tax benefit from share-based compensation	(2,662,000)	(5,141,000)	(2,411,000)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(9,500,000)	(8,585,000)	(15,899,000)
Inventories	9,472,000	(19,436,000)	(8,639,000)
Prepaid expenses and other assets	1,414,000	(3,239,000)	(513,000)
Accounts payable	(4,447,000)	3,430,000	21,065,000
Accrued liabilities and other liabilities	2,610,000	48,972,000	18,288,000
Net cash provided by operating activities	51,870,000	182,489,000	63,139,000
Cash flows from investing activities:
Purchase of severance-related insurance policies	(849,000)	(783,000)	(832,000)
Purchase of short-term investments	(200,377,000)	(328,998,000)	(45,600,000)
Proceeds from sales of short-term investments	122,997,000	14,860,000	149,889,000
Proceeds from maturities of short-term investments	117,806,000	64,683,000	12,128,000
Purchase of property and equipment	(30,911,000)	(30,544,000)	(24,680,000)
Decrease (Increase) in restricted cash deposit	3,468,000	1,327,000	(1,700,000)
Purchase of intangible assets	(7,440,000)
Purchase of equity investments in private companies	(3,123,000)	(1,424,000)
Net cash used in investing activities	(121,948,000)	(280,879,000)	(114,499,000)
Cash flows from financing activities:
Proceeds from public offering, net			104,201,000
Principal payments on capital lease obligations	(1,111,000)	(918,000)	(459,000)
Proceeds from exercise of share awards	14,637,000	29,963,000	18,471,000
Excess tax benefit from share-based compensation	2,662,000	5,141,000	2,411,000
Net cash provided by financing activities	16,188,000	34,186,000	124,624,000
Net (decrease) increase in cash and cash equivalents	(53,890,000)	(64,204,000)	73,264,000
Cash and cash equivalents at beginning of period	117,054,000	181,258,000	107,994,000
Cash and cash equivalents at end of period	63,164,000	117,054,000	181,258,000
Supplemental disclosures of cash flow information
Interest paid	57,000
Income taxes paid	1,305,000	852,000	469,000
Supplemental disclosure of noncash investing and financing activities
Software acquired under capital leases		4,428,000	563,000
Unpaid property and equipment	3,326,000	3,869,000
Inventory capitalization	1,837,000	1,073,000
Vested share awards issued in connection with the Voltaire acquisition			6,303,000
Kotura
Cash flows from investing activities:
Acquisition net of cash acquired	(80,671,000)
IPtronics A/S
Cash flows from investing activities:
Acquisition net of cash acquired	(42,848,000)
Voltaire Ltd
Cash flows from investing activities:
Acquisition net of cash acquired			$ (203,704,000)