Organization and Summary of Significant Accounting Policies (Tables)
|6 Months Ended|
Jun. 30, 2017
|Organization and Summary of Significant Accounting Policies [Abstract]|
|Fair Value of Warrant Liability [Table Text Block]||
As a result of the fair value adjustment of the warrant liabilities, we recorded a non-cash gains on decreases in the fair value of $0.2 million and $0.6 million for the three and six-month periods ended June 30, 2017, respectively, and non-cash losses on increases in the fair value of $0.1 million for the three and six-month periods ended June 30, 2016 in our Condensed Statements of Operations and Comprehensive Income (Loss). See Note 6, “Warrant Liability” for further discussion on the calculation of the fair value of the warrant liability.