| Component: (Network and Table) | |
|---|---|
| Network | 00400 - Statement - STATEMENTS OF CASH FLOWS (http://www.gtxinc.com/role/StatementStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001260990 (http://www.sec.gov/CIK) | 
| STATEMENTS OF CASH FLOWS | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
STATEMENTS OF CASH FLOWS  | |||
Cash flows from operating activities:  | |||
Net loss  | (17,724,000)   | (18,703,000)   | (39,411,000)   | 
Adjustments to reconcile net loss to net cash used in operating activities:  | |||
(Gain) loss on change in fair value of warrant liability  | (8,163,000)   | (3,081,000)   | 8,804,000    | 
Private placement expenses recorded as other income (expense), net  | |||
Share-based compensation  | |||
Directors' deferred compensation  | |||
Depreciation and amortization  | |||
Changes in assets and liabilities:  | |||
Prepaid expenses and other assets  | (  | (  | |
Accounts payable  | (  | (  | |
Accrued expenses and other liabilities  | (  | ||
Net cash used in operating activities  | (  | (  | (  | 
Cash flows from investing activities:  | |||
Purchase of property and equipment  | (  | (  | (  | 
Purchase of short-term investments, held to maturity  | (  | (  | (  | 
Proceeds from maturities of short-term investments, held to maturity  | |||
Net cash provided by (used in) investing activities  | (  | ||
Cash flows from financing activities:  | |||
Net proceeds from the issuance of common stock and warrants  | |||
Tax payments related to shares withheld for vested restricted stock units  | (  | (  | |
Settlement of fractional shares upon reverse stock split  | (  | ||
Payments on capital lease and financed equipment obligations  | (  | ||
Net cash provided by financing activities  | |||
Net (decrease) increase in cash and cash equivalents  | (  | (  | |
Cash and cash equivalents, beginning of period  | 14,056,000    | ||
Cash and cash equivalents, end of period  | 8,910,000    | 14,056,000    | 17,880,000    |