Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Schedule of Shares Subject to Option Awards Outstanding

At September 30, 2016, the following shares were subject to option awards outstanding under the 2005 Equity Incentive Plan:

Plan	Shares Outstanding		Shares Available for Issuance
2005 Equity Incentive Plan		17,000		—

Summary of Stock Option and Warrant Activity under 2005 Equity Incentive Plan and Warrants Issued Outside of Plan to Employees and Consultants

The following is a summary of stock option and warrant activity under the 2005 Equity Incentive Plan as well as the warrants issued outside of the plan to employees and consultants, during the nine months ended September 30, 2016:

	Number of Options or Warrants			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)
Balance outstanding, December 31,  2015		7,337,598		$	0.94		8.62
Granted		4,823,736			0.71		—
Cancelled (unvested)		—			—		—
Expired (vested)		(45,000	)		32.67		—
Balance outstanding, September 30, 2016		12,116,334		$	0.73		7.92
Balance exercisable, September 30, 2016		12,109,330		$	0.73		7.92

Summary of Outstanding Warrants

The following table summarizes outstanding warrants as of September 30, 2016:

	Number of Warrants			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)
Balance outstanding, December 31, 2015		716,748		$	15.98		0.20
Warrants expired		(716,748	)		15.98		—
Balance outstanding, September 30, 2016		—		$	—		—
Warrants exercisable at September 30, 2016		—		$	—		—