v2.4.1.9

Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Stockholders' Equity Attributable to Parent [Abstract] |
Schedule of shares reserved for future issuance | The Company had reserved shares of common stock for future issuance as of December 31, 2014:
Options outstanding under equity incentive plans |  |
2000 Equity Incentive Plan (1) |  | 3,970,662 |
2012 Equity Incentive Plan (1) |  | 3,634,745 |
Shares available for future grants under an equity incentive plan |  |
2012 Equity Incentive Plan (1) |  | 803,630 |
Total shares reserved for future issuance |  | 8,409,037 |
(1) See Note 8 for a description of these plans.

X
- Definition Schedule of Shares Reserved for Future Issuance [Table Text Block] + References No definition available. + Details
Name: | qlys_ScheduleOfSharesReservedForFutureIssuanceTableTextBlock
Namespace Prefix: | qlys_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration