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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue From Contracts With Customers [Abstract] |
Details of Revenue from Contracts with Customers based on Service Contract and Timing of Satisfaction of Performance Obligations | (1) Details of revenue from contracts with customers based on the service contract type and the timing of satisfaction of performance obligations are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (In millions of Korean won) |
Service contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Micro-transaction and subscription revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Online game |  | W |  | 76,110 |  |  | W |  | 30,751 |  |  | W |  | 25,897 |
Mobile game |  |  |  | 251,960 |  |  |  |  | 279,255 |  |  |  |  | 234,991 |
|  |  |  | 328,070 |  |  |  |  | 310,006 |  |  |  |  | 260,888 |
Royalties and license fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Online game |  |  |  | 13,435 |  |  |  |  | 11,571 |  |  |  |  | 13,556 |
Mobile game |  |  |  | 46,364 |  |  |  |  | 22,648 |  |  |  |  | 4,498 |
|  |  |  | 59,799 |  |  |  |  | 34,219 |  |  |  |  | 18,054 |
Others |  |  |  | 18,084 |  |  |  |  | 16,742 |  |  |  |  | 7,828 |
|  |  |  | 405,953 |  |  |  |  | 360,967 |  |  |  |  | 286,770 |
Timing of satisfaction of performance obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At a point in time |  |  |  | — |  |  |  |  | 175 |  |  |  |  | 8 |
Over time |  |  |  | 405,953 |  |  |  |  | 360,792 |  |  |  |  | 286,762 |
|  | W |  | 405,953 |  |  | W |  | 360,967 |  |  | W |  | 286,770 |
Account Receivables, Incremental Costs of Obtaining a Contract, and Contract Liabilities | (2) Accounts receivables, incremental costs of obtaining a contract, and contract liabilities related to contracts with customers as of December 31, 2020 and 2019 are as follows:
|  | 2020 |  |  | 2019 |
|  | (In millions of Korean won) |
Accounts receivables |  | W |  | 59,761 |  |  | W |  | 32,253 |
Incremental costs of obtaining a contract (Prepaid expenses) |  |  |  | 1,277 |  |  |  |  | 998 |
Contract liabilities (Deferred revenue) |  |  |  |  |  |  |  |  |  |
Micro-transaction and subscription revenue |  |  |  | 12,886 |  |  |  |  | 8,742 |
Royalties and license fees |  |  |  | 307 |  |  |  |  | 1,403 |
Website and application development |  |  |  | 600 |  |  |  |  | 701 |
|  | W |  | 13,793 |  |  | W |  | 10,846 |
Changes in Contract Liabilities | (3) Changes in contract liabilities for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (In millions of Korean won) |
Balance at January 1 |  | W |  | 10,846 |  |  | W |  | 20,074 |  |  | W |  | 22,681 |
Increase related to micro-transaction and subscription revenue |  |  |  | 29,124 |  |  |  |  | 66,232 |  |  |  |  | 12,017 |
Increase related to royalties and license fees |  |  |  | 14,330 |  |  |  |  | — |  |  |  |  | 540 |
Increase related to website and application development contract |  |  |  | 4,580 |  |  |  |  | 5,038 |  |  |  |  | 834 |
Decrease upon satisfaction of performance obligations - micro-transaction and subscription revenue |  |  |  | (24,980 | ) |  |  |  | (69,507 | ) |  |  |  | (12,409 | )
Decrease upon satisfaction of performance obligations -royalties and license fees |  |  |  | (15,426 | ) |  |  |  | (5,407 | ) |  |  |  | (3,066 | )
Decrease due to termination of contract |  |  |  | — |  |  |  |  | (413 | ) |  |  |  | (495 | )
Decrease upon satisfaction of performance obligations - website and application development |  |  |  | (4,681 | ) |  |  |  | (5,171 | ) |  |  |  | (28 | )
Balance at December 31 |  | W |  | 13,793 |  |  | W |  | 10,846 |  |  | W |  | 20,074 |
Transaction Price Allocated to Unsatisfied Performance Obligation | (4) Transaction price allocated to unsatisfied performance obligations as of December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (In millions of Korean won) |
Micro-transaction and subscription revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Online game |  | W |  | 8,418 |  |  | W |  | 5,358 |  |  | W |  | 6,160 |
Mobile game |  |  |  | 4,468 |  |  |  |  | 3,384 |  |  |  |  | 5,857 |
|  |  |  | 12,886 |  |  |  |  | 8,742 |  |  |  |  | 12,017 |
Royalties and license fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Online game |  |  |  | 286 |  |  |  |  | 573 |  |  |  |  | 7,203 |
Mobile game |  |  |  | 21 |  |  |  |  | 830 |  |  |  |  | 20 |
|  |  |  | 307 |  |  |  |  | 1,403 |  |  |  |  | 7,223 |
Website and application development |  |  |  | 600 |  |  |  |  | 701 |  |  |  |  | 834 |
Total |  | W |  | 13,793 |  |  | W |  | 10,846 |  |  | W |  | 20,074 |
Details of Incremental Costs of Obtaining Contract Recognized as Assets | (5) Details of incremental costs of obtaining a contract recognized as assets as of and for the years ended December 31, 2020 and 2019 are as follows:
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | (In millions of Korean won) |
Incremental costs of obtaining a contract |  | W |  | 1,277 |  |  | W |  | 998 |
Details of Amortization Costs Recognized as Cost of Revenues | Details of amortization costs recognized as cost of revenues for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (In millions of Korean won) |
Amortization costs recognized as cost of revenues |  | W |  | 998 |  |  | W |  | 2,036 |  |  | W |  | 2,231 |

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