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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events On January 12, 2017, the Company’s board of directors adopted the Mateon Therapeutics, Inc. 2017 Equity Incentive Plan (the “2017 Plan”). Under the 2017 Plan, up to 2,000,000 shares of the Company’s common stock may be issued pursuant to awards granted in the form of nonqualified stock options, restricted and unrestricted stock awards, and other stock-based awards to employees, consultants, and directors.