Organization and Summary of Significant Accounting Policies - Reconciliation of Liabilities Measured at Fair Value using Level 3 Unobservable Inputs (Details) - Significant Unobservable Inputs (Level 3) - Warrants $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 846
Change in fair value measurement of warrant liability	588
Warrant liability reclassified to stockholders' equity	(798)
Ending balance	$ 636