Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Fair Value of Share-Based Compensation, Stock Options

The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.

	Years Ended December 31,
	2014	2013	2012
Assumptions:
Assumed risk-free interest rate	1.63%	1.14%	0.80%
Assumed volatility	73%	72%	72%
Average expected option life	4.5 years	4.5 years	4.5 years
Expected dividend yield	—	—	—