Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 25,943	$ 42,271
Short-term investments	22,890	9,101
Accounts and notes receivable, net of allowance of $285 and $200 as of June 30, 2014 and December 31, 2013, respectively	23,067	22,488
Inventory, net	15,111	11,109
Prepaid expenses and other current assets	8,321	5,397
Deferred income tax assets, net	7,101	7,101
Total current assets	102,433	97,467
Property and equipment, net	17,958	19,043
Deferred income tax assets, net	11,285	13,679
Intangible assets, net	3,219	3,317
Goodwill	2,235	2,235
Long-term investments	10,918	12,023
Other assets	1,309	618
Total assets	149,357	148,382
Current Liabilities:
Accounts payable	5,404	6,221
Accrued liabilities	6,249	8,840
Current portion of deferred revenue	8,231	6,878
Customer deposits	388	1,154
Current portion of capital lease payable	37	36
Total current liabilities	20,309	23,129
Deferred revenue, net of current portion	15,908	13,341
Liability for unrecognized tax benefits	1,865	3,122
Other long-term liabilities	760	376
Long-term portion of capital lease payable	48	67
Total liabilities	38,890	40,035
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.00001 par value per share; 25 million shares authorized; no shares issued at June 30, 2014 and December 31, 2013	0	0
Common stock, $0.00001 par value per share; 200 million shares authorized; 52,570,105 and 52,725,247 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	1	1
Additional paid-in capital	153,806	139,424
Treasury stock at cost, 17,897,956 and 16,412,755 shares at June 30, 2014 and December 31, 2013, respectively	(111,755)	(92,203)
Retained earnings	68,402	61,127
Accumulated other comprehensive income (loss)	13	(2)
Total stockholders' equity	110,467	108,347
Total liabilities and stockholders' equity	$ 149,357	$ 148,382