Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 42,271	$ 36,127
Short-term investments	9,101	1,681
Accounts and notes receivable, net of allowance of $200 as of December 31, 2013 and 2012, respectively	22,488	18,101
Inventory, net	11,109	10,993
Prepaid expenses and other current assets	5,397	2,755
Deferred income tax assets, net	7,101	9,396
Total current assets	97,467	79,053
Property and equipment, net	19,043	21,952
Deferred income tax assets, net	13,679	11,606
Intangible assets, net	3,317	3,317
Goodwill, net	2,235	0
Long-term investments	12,023
Other assets	618	308
Total assets	148,382	116,236
Current liabilities:
Accounts payable	6,221	6,223
Accrued liabilities	8,840	7,065
Current portion of deferred revenue	6,878	4,287
Customer deposits	1,154	500
Current portion of capital lease payable	36	34
Total current liabilities	23,129	18,109
Deferred revenue, net of current portion	13,341	7,836
Liability for unrecognized tax benefits	3,122	2,903
Long-term deferred compensation	376
Long-term portion of capital lease payable	67	103
Total liabilities	40,035	28,951
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of December 31, 2013 and 2012
Common stock, $0.00001 par value; 200,000,000 shares authorized; 52,725,247 and 52,770,392 shares issued and outstanding as of December 31, 2013 and 2012, respectively	1	1
Additional paid-in capital	139,424	111,661
Treasury stock at cost, 16,412,755 and 13,363,789 shares as of December 31, 2013 and 2012, respectively	(92,203)	(67,203)
Retained earnings	61,127	42,883
Accumulated other comprehensive loss	(2)	(57)
Total stockholders' equity	108,347	87,285
Total liabilities and stockholders' equity	$ 148,382	$ 116,236