Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 48,367	$ 42,271
Short-term investments	32,774	9,101
Accounts and notes receivable, net of allowance of $251 and 200 as of December 31, 2014 and 2013, respectively	30,735	22,488
Inventory, net	18,323	11,109
Prepaid expenses and other current assets	4,443	5,397
Deferred income tax assets, net	5,186	7,101
Total current assets	139,828	97,467
Property and equipment, net	17,523	19,043
Deferred income tax assets, net	10,877	13,679
Intangible assets, net	3,115	3,317
Goodwill, net	2,206	2,235
Long-term investments	9,296	12,023
Other assets	2,523	618
Total assets	185,368	148,382
Current liabilities:
Accounts payable	7,682	6,221
Accrued liabilities	9,245	8,840
Current portion of deferred revenue	14,020	6,878
Customer deposits	988	1,154
Current portion of capital lease payable	38	36
Total current liabilities	31,973	23,129
Deferred revenue, net of current portion	21,668	13,341
Liability for unrecognized tax benefits	1,471	3,122
Long-term deferred compensation	1,121	376
Long-term portion of capital lease payable	29	67
Total liabilities	56,262	40,035
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.00001 par value; 200,000,000 shares authorized; 53,000,867 and 52,725,247 shares issued and outstanding as of December 31, 2014 and 2013, respectively	1	1
Additional paid-in capital	162,641	139,424
Treasury stock at cost, 18,139,958 and 16,412,755 shares as of December 31, 2014 and 2013, respectively	(114,645)	(92,203)
Retained earnings	81,045	61,127
Accumulated other comprehensive income (loss)	64	(2)
Total stockholders’ equity	129,106	108,347
Total liabilities and stockholders’ equity	$ 185,368	$ 148,382