Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 176,000	$ 172,250
Short-term investments	330,914	178,534
Accounts and notes receivable, net of allowance of $1,787 and $1,567 as of September 30, 2020 and December 31, 2019, respectively	172,803	146,878
Contract assets, net	63,105	38,102
Inventory	97,610	38,845
Prepaid expenses and other current assets	35,421	34,866
Total current assets	875,853	609,475
Property and equipment, net	102,718	43,770
Deferred tax assets, net	39,773	27,688
Intangible assets, net	10,260	12,771
Goodwill	25,012	25,013
Long-term investments	120,615	45,499
Long-term notes receivable, net of current portion	22,611	31,598
Long-term contract assets, net	15,019	9,644
Other assets	67,288	40,181
Total assets	1,279,149	845,639
Current liabilities:
Accounts payable	22,441	25,874
Accrued liabilities	74,114	45,001
Current portion of deferred revenue	154,731	117,864
Other current liabilities	5,137	3,853
Total current liabilities	258,555	195,566
Deferred revenue, net of current portion	87,733	87,936
Liability for unrecognized tax benefits	4,406	3,832
Long-term deferred compensation	4,150	3,936
Deferred tax liability, net	560	354
Other long-term liabilities	28,592	10,520
Total liabilities	383,996	302,144
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, 2020 and December 31, 2019, respectively
Common stock, $0.00001 par value; 200,000,000 shares authorized; 63,548,081 and 59,497,759 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital	908,584	528,272
Treasury stock at cost, 20,220,227 shares as of September 30, 2020 and December 31, 2019	(155,947)	(155,947)
Retained earnings	144,067	172,265
Accumulated other comprehensive loss	(1,552)	(1,096)
Total stockholders' equity	895,153	543,495
Total liabilities and stockholders' equity	1,279,149	845,639
Current portion of deferred revenue
Current liabilities:
Current portion of deferred revenue	154,731	117,864
Customer deposits
Current liabilities:
Current portion of deferred revenue	$ 2,132	$ 2,974