Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 281,691	$ 155,440
Marketable Securities	83,340
Short-term investments	216,557	406,525
Accounts and notes receivable, net of allowance of $2,425 and $2,105 as of September 30, 2021 and December 31, 2020, respectively	265,267	229,201
Contract assets, net	130,976	63,945
Inventory	93,279	89,958
Prepaid expenses and other current assets	52,710	36,883
Total current assets	1,123,820	981,952
Property and equipment, net	128,808	105,494
Deferred tax assets, net	104,169	45,770
Intangible assets, net	7,426	9,448
Goodwill	25,571	25,205
Long-term investments	49,431	90,681
Long-term notes receivable, net of current portion	12,621	22,457
Long-term contract assets, net	43,394	20,099
Strategic investments	58,520	11,711
Other assets	91,627	68,206
Total assets	1,645,387	1,381,023
Current liabilities:
Accounts payable	27,418	24,142
Accrued liabilities	88,894	59,843
Current portion of deferred revenue	250,651	163,959
Customer deposits	6,118	2,956
Other current liabilities	6,809	5,431
Total current liabilities	379,890	256,331
Deferred revenue, net of current portion	111,892	111,222
Liability for unrecognized tax benefits	4,580	4,503
Long-term deferred compensation	5,125	4,732
Deferred tax liability, net	155	649
Other long-term liabilities	29,842	27,331
Total liabilities	531,484	404,768
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively
Common stock, $0.00001 par value; 200,000,000 shares authorized; 67,577,868 and 63,766,555 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	1	1
Additional paid-in capital	1,147,478	962,159
Treasury stock at cost, 20,220,227 shares as of September 30, 2021 and December 31, 2020	(155,947)	(155,947)
Retained earnings	123,391	169,901
Accumulated other comprehensive income (loss)	(1,020)	141
Total stockholders' equity	1,113,903	976,255
Total liabilities and stockholders' equity	$ 1,645,387	$ 1,381,023