Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Schedule of Shares Subject to Option Awards Outstanding

At March 31, 2017, 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 Directors

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 directors, during the three months ended March 31, 2017:

	Number of Options or Warrants		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)
Balance outstanding, December 31, 2016		12,116,334	$	0.73		7.67
Granted		—		—		—
Cancelled (unvested)		—		—		—
Expired (vested)		—		—		—
Balance outstanding, March 31, 2017		12,116,334	$	0.73		7.37
Balance exercisable, March 31, 2017		12,110,469	$	0.73		7.37