Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 38,615	$ 42,271
Short-term investments	28,983	9,101
Accounts and notes receivable, net of allowance of $253 and $200 as of September 30, 2014 and December 31, 2013, respectively	27,099	22,488
Inventory, net	16,128	11,109
Prepaid expenses and other current assets	5,210	5,397
Deferred income tax assets, net	7,164	7,101
Total current assets	123,199	97,467
Property and equipment, net of accumulated depreciation of $33,046 and $31,378 as of September 30, 2014 and December 31, 2014, respectively	17,848	19,043
Deferred income tax assets, net	9,603	13,679
Intangible assets, net	3,107	3,317
Goodwill	2,206	2,235
Long-term investments	6,411	12,023
Other assets	1,766	618
Total assets	164,140	148,382
Current Liabilities:
Accounts payable	6,483	6,221
Accrued liabilities	6,853	8,840
Current portion of deferred revenue	10,033	6,878
Customer deposits	369	1,154
Current portion of capital lease payable	38	36
Total current liabilities	23,776	23,129
Deferred revenue, net of current portion	19,966	13,341
Liability for unrecognized tax benefits	1,409	3,122
Other long-term liabilities	908	376
Long-term portion of capital lease payable	39	67
Total liabilities	46,098	40,035
Commitments and Contingencies (Note 10)
Stockholders' Equity
Preferred stock, $0.00001 par value per share; 25 million shares authorized; no shares issued at September 30, 2014 and December 31, 2013
Common stock, $0.00001 par value per share; 200 million shares authorized; 52,516,219 and 52,725,247 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	1	1
Additional paid-in capital	156,729	139,424
Treasury stock at cost, 18,139,958 and 16,412,755 shares at September 30, 2014 and December 31, 2013, respectively	(114,645)	(92,203)
Retained earnings	75,959	61,127
Accumulated other comprehensive loss	(2)	(2)
Total stockholders' equity	118,042	108,347
Total liabilities and stockholders' equity	$ 164,140	$ 148,382