Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 75,105	$ 40,651
Short-term investments	6,862	48,415
Accounts and notes receivable, net of allowance of $754 and $443 as of December 31, 2017 and 2016, respectively	56,064	39,466
Inventory	45,465	34,841
Prepaid expenses and other current assets	21,696	13,858
Total current assets	205,192	177,231
Property and equipment, net	31,172	24,004
Deferred income tax assets, net	15,755	19,515
Intangible assets, net	18,823	15,218
Goodwill	14,927	10,442
Long-term investments	0	234
Long-term accounts and notes receivable, net of current portion	36,877	17,602
Other assets	15,366	13,917
Total assets	338,112	278,163
Current liabilities:
Accounts payable	8,592	10,736
Accrued liabilities	23,502	18,248
Current portion of deferred revenue	70,401	45,137
Customer deposits	3,673	2,148
Current portion of business acquisition contingent consideration	1,693	1,690
Other current liabilities	89	80
Total current liabilities	107,950	78,039
Deferred revenue, net of current portion	54,881	40,054
Liability for unrecognized tax benefits	1,706	1,896
Long-term deferred compensation	3,859	3,362
Business acquisition contingent consideration, net of current portion	1,048	1,635
Other long-term liabilities	1,224	2,289
Total liabilities	170,668	127,275
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of December 31, 2017 and 2016	0	0
Common stock, $0.00001 par value; 200,000,000 shares authorized; 52,969,869 and 52,325,251 shares issued and outstanding as of December 31, 2017 and 2016, respectively	1	1
Additional paid-in capital	201,672	187,656
Treasury stock at cost, 20,220,227 shares as of December 31, 2017 and 2016	(155,947)	(155,947)
Retained earnings	123,185	118,275
Accumulated other comprehensive income (loss)	(1,467)	903
Total stockholders’ equity	167,444	150,888
Total liabilities and stockholders’ equity	$ 338,112	$ 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).