Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 156,540	$ 172,250
Short-term investments	188,673	178,534
Accounts and notes receivable, net of allowance of $1,827 and $1,567 as of March 31, 2020 and December 31, 2019, respectively	147,945	146,878
Contract assets, net	43,959	38,102
Inventory	46,922	38,845
Prepaid expenses and other current assets	34,702	34,866
Total current assets	618,741	609,475
Property and equipment, net	43,065	43,770
Deferred tax assets, net	29,433	27,688
Intangible assets, net	11,929	12,771
Goodwill	24,752	25,013
Long-term investments	50,225	45,499
Long-term notes receivable, net of current portion	27,556	31,598
Long-term contract assets, net	12,293	9,644
Other assets	59,457	40,181
Total assets	877,451	845,639
Current liabilities:
Accounts payable	31,568	25,874
Accrued liabilities	36,404	45,001
Current portion of deferred revenue	119,827	117,864
Other current liabilities	3,891	3,853
Total current liabilities	195,015	195,566
Deferred revenue, net of current portion	91,886	87,936
Liability for unrecognized tax benefits	4,173	3,832
Long-term deferred compensation	3,430	3,936
Deferred tax liability, net	342	354
Other long-term liabilities	23,015	10,520
Total liabilities	317,861	302,144
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively		0
Common stock, $0.00001 par value; 200,000,000 shares authorized; 59,813,163 and 59,497,759 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital	543,305	528,272
Treasury stock at cost, 20,220,227 shares as of March 31, 2020 and December 31, 2019	(155,947)	(155,947)
Retained earnings	175,699	172,265
Accumulated other comprehensive loss	(3,468)	(1,096)
Total stockholders' equity	559,590	543,495
Total liabilities and stockholders' equity	877,451	845,639
Current portion of deferred revenue
Current liabilities:
Current portion of deferred revenue	119,827	117,864
Customer deposits
Current liabilities:
Current portion of deferred revenue	$ 3,325	$ 2,974