Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 45,133	$ 42,271
Short-term investments	17,700	9,101
Accounts and notes receivable, net of allowance of $200 as of March 31, 2014 and December 31, 2013	20,501	22,488
Inventory, net	13,252	11,109
Prepaid expenses and other current assets	9,398	5,397
Deferred income tax assets, net	7,101	7,101
Total current assets	113,085	97,467
Property and equipment, net	18,398	19,043
Deferred income tax assets, net	12,001	13,679
Intangible assets, net	3,264	3,317
Goodwill	2,235	2,235
Long-term investments	14,674	12,023
Other assets	1,105	618
Total assets	164,762	148,382
Current Liabilities:
Accounts payable	7,013	6,221
Accrued liabilities	9,407	8,840
Current portion of deferred revenue	7,414	6,878
Customer deposits	543	1,154
Current portion of capital lease payable	37	36
Total current liabilities	24,414	23,129
Deferred revenue, net of current portion	14,112	13,341
Liability for unrecorded tax benefits	1,837	3,122
Other long-term liabilities	555	376
Long-term portion of capital lease payable	58	67
Total liabilities	40,976	40,035
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.00001 par value per share; 25 million shares authorized; no shares issued at March 31, 2014 and December 31, 2013
Common stock, $0.00001 par value per share; 200 million shares authorized; 53,994,484 and 52,725,247 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	1	1
Additional paid-in capital	151,461	139,424
Treasury stock at cost, 16,412,755 shares at March 31, 2014 and December 31, 2013	(92,203)	(92,203)
Retained earnings	64,519	61,127
Accumulated other comprehensive income (loss)	8	(2)
Total stockholders' equity	123,786	108,347
Total liabilities and stockholders' equity	$ 164,762	$ 148,382