Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 319,253	$ 172,250
Short-term investments	237,980	178,534
Accounts and notes receivable, net of allowance of $1,672 and $1,567 as of June 30, 2020 and December 31, 2019, respectively	154,253	146,878
Contract assets, net	50,799	38,102
Inventory	81,010	38,845
Prepaid expenses and other current assets	42,429	34,866
Total current assets	885,724	609,475
Property and equipment, net	45,386	43,770
Deferred tax assets, net	34,142	27,688
Intangible assets, net	11,146	12,771
Goodwill	24,905	25,013
Long-term investments	129,580	45,499
Long-term notes receivable, net of current portion	26,115	31,598
Long-term contract assets, net	12,108	9,644
Other assets	63,806	40,181
Total assets	1,232,912	845,639
Current liabilities:
Accounts payable	40,105	25,874
Accrued liabilities	64,467	45,001
Current portion of deferred revenue	129,518	117,864
Other current liabilities	4,882	3,853
Total current liabilities	242,830	195,566
Deferred revenue, net of current portion	83,150	87,936
Liability for unrecognized tax benefits	4,445	3,832
Long-term deferred compensation	3,990	3,936
Deferred tax liability, net	447	354
Other long-term liabilities	28,237	10,520
Total liabilities	363,099	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 June 30, 2020 and December 31, 2019, respectively
Common stock, $0.00001 par value; 200,000,000 shares authorized; 63,468,347 and 59,497,759 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	1	1
Additional paid-in capital	883,609	528,272
Treasury stock at cost, 20,220,227 shares as of June 30, 2020 and December 31, 2019	(155,947)	(155,947)
Retained earnings	144,940	172,265
Accumulated other comprehensive loss	(2,790)	(1,096)
Total stockholders' equity	869,813	543,495
Total liabilities and stockholders' equity	1,232,912	845,639
Current portion of deferred revenue
Current liabilities:
Current portion of deferred revenue	129,518	117,864
Customer deposits
Current liabilities:
Current portion of deferred revenue	$ 3,858	$ 2,974