Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 59,526	$ 48,367
Short-term investments	50,254	32,774
Accounts and notes receivable, net of allowance of $322 and $251 as of December 31, 2015 and 2014, respectively	27,701	30,735
Inventory	15,763	18,323
Prepaid expenses and other current assets	8,165	4,443
Total current assets	161,409	134,642
Property and equipment, net	21,848	17,523
Deferred income tax assets, net	13,719	16,063
Intangible assets, net	7,588	3,115
Goodwill	9,596	2,206
Long-term investments	8,525	9,296
Other assets	7,196	2,523
Total assets	229,881	185,368
Current liabilities:
Accounts payable	7,333	7,682
Accrued liabilities	8,643	9,245
Current portion of deferred revenue	20,851	14,020
Customer deposits	1,226	988
Current portion of notes payable and capital lease payable	87	38
Total current liabilities	38,140	31,973
Deferred revenue, net of current portion	30,190	21,668
Liability for unrecognized tax benefits	1,315	1,471
Long-term deferred compensation	2,199	1,121
Long-term business acquisition contingent consideration	952	0
Long-term portion of notes payable and capital lease payable	81	29
Total liabilities	$ 72,877	$ 56,262
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, 2015 and 2014	$ 0	$ 0
Common stock, $0.00001 par value; 200,000,000 shares authorized; 53,692,192 and 53,000,867 shares issued and outstanding as of December 31, 2015 and 2014, respectively	1	1
Additional paid-in capital	178,143	162,641
Treasury stock at cost,18,432,158 and 18,139,958 shares as of December 31, 2015 and 2014, respectively	(122,201)	(114,645)
Retained earnings	100,978	81,045
Accumulated other comprehensive income	83	64
Total stockholders’ equity	157,004	129,106
Total liabilities and stockholders’ equity	$ 229,881	$ 185,368