Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 266,372	$ 155,440
Short-term investments	388,895	406,525
Accounts and notes receivable, net of allowance of $1,973 and $2,105 as of June 30, 2021 and December 31, 2020, respectively	201,907	229,201
Contract assets, net	86,561	63,945
Inventory	91,739	89,958
Prepaid expenses and other current assets	45,456	36,883
Total current assets	1,080,930	981,952
Property and equipment, net	119,933	105,494
Deferred tax assets, net	52,387	45,770
Intangible assets, net	7,870	9,448
Goodwill	25,178	25,205
Long-term investments	48,669	90,681
Long-term notes receivable, net of current portion	17,466	22,457
Long-term contract assets, net	31,691	20,099
Strategic investments	58,520	11,711
Other assets	84,244	68,206
Total assets	1,526,888	1,381,023
Current liabilities:
Accounts payable	7,778	24,142
Accrued liabilities	66,908	59,843
Contract with customer, liability, current	186,909	163,959
Other current liabilities	6,404	5,431
Total current liabilities	272,871	256,331
Deferred revenue, net of current portion	113,815	111,222
Liability for unrecognized tax benefits	4,550	4,503
Long-term deferred compensation	5,216	4,732
Deferred tax liability, net	377	649
Other long-term liabilities	32,360	27,331
Total liabilities	429,189	404,768
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 June 30, 2021 and December 31, 2020, respectively
Common stock, $0.00001 par value; 200,000,000 shares authorized; 65,674,346 and 63,766,555 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	1	1
Additional paid-in capital	1,179,005	962,159
Treasury stock at cost, 20,220,227 shares as of June 30, 2021 and December 31, 2020	(155,947)	(155,947)
Retained earnings	74,867	169,901
Accumulated other comprehensive income (loss)	(227)	141
Total stockholders' equity	1,097,699	976,255
Total liabilities and stockholders' equity	1,526,888	1,381,023
Current portion of deferred revenue
Current liabilities:
Contract with customer, liability, current	186,909	163,959
Customer deposits
Current liabilities:
Contract with customer, liability, current	$ 4,872	$ 2,956