Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 26,647	$ 6,929
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization expense	1,917	1,243
Amortization of deferred rent	(41)	(23)
Stock-based compensation expense	241	187
Provision for doubtful accounts	25	312
Write-down of inventory to net realizable value	1,235	188
Loss on disposal of assets	0	5
Tax benefit from exercise of stock options	(2)	0
Changes in operating assets and liabilities:
Receivables	44	1,081
Inventories	447	(3,066)
Deferred income taxes	(1,457)	1,416
Prepaid expenses and other assets	(652)	(305)
Accounts payable	(512)	634
Accrued liabilities	(130)	(2,277)
Income taxes payable	14,492	250
Deferred product revenue	189	(902)
Other long-term liabilities	1,481	127
Net cash provided by operating activities	43,924	5,799
Cash flows from investing activities:
Payment towards business acquisitions	(4,632)	(980)
Purchase of property and equipment	(574)	(380)
Net cash used in investing activities	(5,206)	(1,360)
Cash flows from financing activities:
Proceeds from the exercise of stock options	490	747
Tax benefit from the exercise of stock options	2	66
Treasury stock purchased	(384)	0
Net cash provided by (used in) financing activities	108	813
Net increase in cash and cash equivalents	38,826	5,252
Cash and cash equivalents at the beginning of the period	16,683	11,431
Cash and cash equivalents at the end of the period	55,509	16,683
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,393	1,705
Supplemental disclosure of non-cash activities:
Exchanged accounts receivable from a vendor with accounts payable to the same vendor	0	182
Transfer from property and equipment to inventory	$ 0	$ 78