Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 155,440	$ 172,250
Short-term investments	406,525	178,534
Accounts and notes receivable, net of allowance of $2,105 and $1,567 as of December 31, 2020 and December 31, 2019 respectively	229,201	146,878
Contract assets, net	63,945	38,102
Inventory	89,958	38,845
Prepaid expenses and other current assets	36,883	34,866
Total current assets	981,952	609,475
Property and equipment, net	105,494	43,770
Deferred tax assets, net	45,770	27,688
Intangible assets, net	9,448	12,771
Goodwill	25,205	25,013
Long-term investments	90,681	45,499
Long-term notes receivable, net	22,457	31,598
Long-term contract assets, net	20,099	9,644
Other assets	79,917	40,181
Total assets	1,381,023	845,639
Current liabilities:
Accounts payable	24,142	25,874
Accrued liabilities	59,843	45,001
Contract with customer, liability, current	163,959	117,864
Other current liabilities	5,431	3,853
Total current liabilities	256,331	195,566
Deferred revenue, net of current portion	111,222	87,936
Liability for unrecognized tax benefits	4,503	3,832
Long-term deferred compensation	4,732	3,936
Deferred tax liabilities, net	649	354
Other long-term liabilities	27,331	10,520
Total liabilities	404,768	302,144
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $0.00001 par value; 25,000,000 shares authorized; no shares issued and outstanding as of December 31, 2020 and December 31, 2019, respectively
Common stock, $0.00001 par value; 200,000,000 shares authorized; 63,766,555 and 59,497,759 shares issued and outstanding as of December 31, 2020 and December 31, 2019 respectively	1	1
Additional paid-in capital	962,159	528,272
Treasury stock at cost, 20,220,227 shares as of December 31, 2020 and December 31, 2019	(155,947)	(155,947)
Retained earnings	169,901	172,265
Accumulated other comprehensive income (loss)	141	(1,096)
Total stockholders' equity	976,255	543,495
Total liabilities and stockholders' equity	1,381,023	845,639
Current portion of deferred revenue
Current liabilities:
Contract with customer, liability, current	163,959	117,864
Customer deposits
Current liabilities:
Contract with customer, liability, current	$ 2,956	$ 2,974