Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 43,471	$ 40,651
Short-term investments	18,372	48,415
Accounts and notes receivable, net of allowance of $801 and $443 as of September 30, 2017 and December 31, 2016, respectively	51,204	39,466
Inventory	52,692	34,841
Prepaid expenses and other current assets	23,002	13,858
Total current assets	188,741	177,231
Property and equipment, net of accumulated depreciation of $35,484 and $37,799 as of September 30, 2017 and December 31, 2016, respectively	31,263	24,004
Deferred income tax assets, net	22,845	19,515
Intangible assets, net	20,758	15,218
Goodwill	14,923	10,442
Long-term investments	0	234
Long-term accounts and notes receivable, net of current portion	32,543	17,602
Other assets	16,534	13,917
Total assets	327,607	278,163
Current liabilities:
Accounts payable	12,354	10,736
Accrued liabilities	22,431	18,248
Current portion of deferred revenue	60,453	45,137
Customer deposits	2,648	2,148
Current portion of business acquisition contingent consideration	1,735	1,690
Other current liabilities	470	80
Total current liabilities	100,091	78,039
Deferred revenue, net of current portion	51,574	40,054
Liability for unrecognized tax benefits	1,763	1,896
Long-term deferred compensation	3,533	3,362
Business acquisition contingent consideration, net of current portion	2,715	1,635
Other long-term liabilities	1,851	2,289
Total liabilities	161,527	127,275
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of September 30, 2017 and December 31, 2016	0	0
Common stock, $0.00001 par value; 200,000,000 shares authorized; 52,853,920 and 52,325,251 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	1	1
Additional paid-in capital	197,978	187,656
Treasury stock at cost, 20,220,227 shares as of September 30, 2017 and December 31, 2016	(155,947)	(155,947)
Retained earnings	125,256	118,275
Accumulated other comprehensive income	(1,208)	903
Total stockholders’ equity	166,080	150,888
Total liabilities and stockholders’ equity	$ 327,607	$ 278,163

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).