Condensed Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net loss before income tax	$ (35,774,000)	$ (28,730,000)	$ 10,653,000
Adjustments to reconcile net loss to net cash used in operating activities:
Bad debt expense	325,000	62,000	39,000
Depreciation and amortization	2,183,000	2,729,000	2,444,000
Stock-based compensation	6,471,000	4,136,000	2,546,000
Change in fair value of contingent consideration related to acquisition	13,700,000	10,500,000	0
Gain on sale of equipment	0	(141,000)	0
Income Tax Expense (Benefit)	531,000	(86,000)	(15,067,000)
Changes in operating assets and liabilities:
Accounts receivable	(8,319,000)	(3,392,000)	(3,909,000)
Inventories	12,000	(9,801,000)	(2,964,000)
Prepaid expenses and other current assets	(408,000)	(153,000)	(672,000)
Accounts payable	199,000	700,000	2,098,000
Accrued payroll	1,255,000	1,597,000	498,000
Accrued expenses and other current liabilities	1,304,000	189,000	243,000
Deferred rent	(8,000)	8,000	(22,000)
Net cash used in operating activities	(18,529,000)	(22,382,000)	(4,113,000)
Cash flows from investing activities:
Purchases of property and equipment	(2,238,000)	(3,033,000)	(861,000)
Purchases of patent license	(100,000)	0	0
Cash acquired in Nellix acquisition	0	0	698,000
Business acquisition	(1,156,000)	0	0
Net cash used in investing activities	(3,494,000)	(3,033,000)	(163,000)
Cash flows from financing activities:
Proceeds from sale of common stock under secondary offering, net of expenses	40,069,000	0	14,990,000
Proceeds from sale of common stock under employee stock purchase plan	2,369,000	1,965,000	1,118,000
Proceeds from exercise of stock options	4,992,000	5,324,000	2,347,000
Repayments of long-term debt	0	0	(79,000)
Net cash provided by financing activities	47,430,000	7,289,000	18,376,000
Effect of exchange rate changes on cash and cash equivalents	(324,000)	(30,000)	26,000
Net decrease in cash and cash equivalents	25,083,000	(18,156,000)	14,126,000
Cash and cash equivalents, beginning of period	20,035,000	38,191,000	24,065,000
Cash and cash equivalents, end of period	45,118,000	20,035,000	38,191,000
Supplemental disclosure of cash flow information:
Cash paid for interest	10,000	32,000	16,000
Cash paid for legal settlement	16,000	24,000	51,000
Non-cash investing and financing activities:
Shares issued for acquisition	$ 0	$ 0	$ 19,388,000