Years Ended December 31,
Years Ended December 31,
Years Ended December 31,
Years Ended December 31,
Years Ended December 31,
(in thousands, except per share amounts)
2019
2018
2017
2016
2015
Consolidated Statement of Operations Data
Revenue
$212,628
$232,223
$235,429
$227,297
$196,285
Cost of revenue
$48,881
$51,896
$53,318
$54,413
$48,402
Gross profit
$163,747
$180,327
$182,111
$172,884
$147,883
Loss from operations
$(17,094)
$(27,679)
$(10,372)
$(20,570)
$(40,309)
Net loss
$(17,819)
$(27,617)
$(10,751)
$(22,391)
$(41,897)
Net loss per share: basic and diluted
$(0.23)
$(0.38)
$(0.15)
$(0.34)
$(0.67)
Weighted-average shares used in computing net
loss per share: basic and diluted
76,080
72,882
70,053
65,701
62,428
Consolidated Balance Sheet Data:
Cash,cash equivalents and marketable securities
$129,922
$128,375
$131,134
$114,347
$98,117
Working capital
$123,358
$117,572
$111,076
$95,285
$89,550
Total assets
$274,053
$235,876
$224,858
$216,733
$189,892
Deferred revenue(current and non-current)
$101,164
$97,966
$94,637
$91,617
$72,008
Total stockholders’ equity
$108,787
$103,883
$98,386
$82,752
$78,205
item 6 .
selected financial data .
we have derived the consolidated statement of operations data for the years ended december 31 2019 2018 and 2017 and the selected consolidated balance sheet data as of december 31 2019 and 2018 from our audited consolidated financial statements that are included in this form 10-k .
the following selected consolidated statement of operations data for the years ended december 31 2016 and 2015 and the selected consolidated balance sheet data as of december 31 2017 2016 and 2015 are derived from our audited consolidated financial statements that are not included in this report .
our historical operating results are not necessarily indicative of future operating results these selected consolidated financial data should be read in conjunction with the consolidated financial statements and accompanying notes in part ii item 8 and management ’ s discussion and analysis of financial condition and results of operations in part ii item 7 included in this report .
the amounts as of and for the years ended december 31 2019 and 2018 have been prepared based on our adoption of accounting standards codification - ‘ ‘ asc ’ ’ no .
606 contracts with customers .
we elected to adopt this accounting standard on a modified retrospective basis which resulted in the impact of adoption being recorded as of january 1 2018 .
the amounts in all other years other than 2019 and 2018 in the tables below have been prepared on the previously outstanding guidance on revenue recognition .
we have disclosed the asc 606 adoption impact on our revenue recognition in note 2 of the audited consolidated financial statements included in part ii item 8 of this report .
the amounts as of and for the years ended december 31 2019 and 2018 have been prepared based on our adoption of accounting standards codification - ‘ ‘ asc ’ ’ no .
606 contracts with customers .
we elected to adopt this accounting standard on a modified retrospective basis which resulted in the impact of adoption being recorded as of january 1 2018 .
the amounts in all other years other than 2019 and 2018 in the tables below have been prepared on the previously outstanding guidance on revenue recognition .
we have disclosed the asc 606 adoption impact on our revenue recognition in note 2 of the audited consolidated financial statements included in part ii item 8 of this report .

Question: What is the accounting standards used to prepare the financial statements?
Answer: Accounting Standards Codification