Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 40,354	$ 48,367
Short-term investments	46,252	32,774
Accounts and notes receivable, net of allowance of $250 and $251 as of June 30, 2015 and December 31, 2014, respectively	25,753	30,735
Inventory, net	23,687	18,323
Prepaid expenses and other current assets	10,068	4,443
Deferred income tax assets, net	5,186	5,186
Total current assets	151,300	139,828
Property and equipment, net of accumulated depreciation of $34,881 and $33,906 as of June 30, 2015 and December 31, 2014, respectively	18,231	17,523
Deferred income tax assets, net	10,398	10,877
Intangible assets, net	7,085	3,115
Goodwill	7,786	2,206
Long-term investments	12,377	9,296
Other assets	4,976	2,523
Total assets	212,153	185,368
Current liabilities:
Accounts payable	7,477	7,682
Accrued liabilities	6,605	9,245
Current portion of deferred revenue	16,249	14,020
Customer deposits	1,322	988
Current portion of capital lease payable	40	38
Total current liabilities	31,693	31,973
Deferred revenue, net of current portion	22,725	21,668
Liability for unrecognized tax benefits	1,152	1,471
Long-term deferred compensation	1,739	1,121
Long-term contingent consideration	950	0
Long-term portion of capital lease payable	9	29
Total liabilities	$ 58,268	$ 56,262
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of June 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $0.00001 par value; 200,000,000 shares authorized; 53,865,918 and 53,000,867 shares issued and outstanding as of June 30, 2015 and December 31, 2014, respectively	1	1
Additional paid-in capital	174,015	162,641
Treasury stock at cost, 18,139,958 shares as of June 30, 2015 and December 31, 2014	(114,645)	(114,645)
Retained earnings	94,353	81,045
Accumulated other comprehensive income	161	64
Total stockholders’ equity	153,885	129,106
Total liabilities and stockholders’ equity	$ 212,153	$ 185,368

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).