CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (6,717)		$ 579
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	431		133
Amortization of intangible assets	376		0
Stock-based compensation expense
Stock options	1,323		583
Restricted stock awards	275		128
Amortization of premium on investments	306		68
Provision for bad debts	0		6
Provision for excess and obsolete inventory	89		83
Changes in deferred taxes	(719)		0
Changes in assets and liabilities:
Accounts receivable	4,234		3,185
Inventories	(1,149)		(838)
Prepaid expenses and other current assets	1,843		(198)
Deferred compensation advanced to escrow	(2,701)		0
Accounts payable	(517)		200
Accrued liabilities	(1,009)		(254)
Deferred revenue	(645)		(28)
Net cash provided by (used in) operating activities	(4,580)		3,647
Cash flows from investing activities:
Purchase of Vineyard Networks, net of cash received	(8,962)		0
Purchase of property and equipment	(1,274)		(645)
Purchase of short-term investments	(26,125)		(4,538)
Sales of short-term investments	6,212		2,002
Maturities of short-term investments	20,735		2,750
Net cash used in investing activities	(9,414)		(431)
Cash flows from financing activities:
Proceeds from issuance of common stock	0		835
Proceeds from exercise of stock options	114		0
Payments on notes payable	(497)		0
Net cash provided by (used in) financing activities	(383)		835
Effect of exchange rates on cash and cash equivalents	(20)		40
Net increase (decrease) in cash and cash equivalents	(14,397)		4,091
Cash and cash equivalents, beginning of period	30,933	[1]	23,900
Cash and cash equivalents, end of period	16,536		27,991
Noncash Investing and Financing Items [Abstract]
Issuance of common stock in connection with Vineyard acquisition	$ 11,140		$ 0

[1] Amounts have been derived from the December 31, 2012 audited consolidated financial statements.