Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Shares of Common Stock Issuable on Conversion or Exercise of Rights Granted

As of December 31, 2016, approximately 25.2 million shares of our common stock were issuable upon conversion, or exercise of rights granted (regardless of whether in or out-of-the-money), as summarized below:

2018 Convertible Notes	10,454,799
Exercise of issued employee stock options	14,340,582
Exercise of issued warrants	445,000
Management incentive plan restricted stock units	—
Total common shares issuable	25,240,381

Summary of Warrant Activity

A summary of warrant activity is as follows:

	Number of Shares	Weighted Average Exercise Price
Outstanding — December 31, 2013	445,000	$	6.39
Granted	—	—
Outstanding — December 31, 2014	445,000	$	6.39
Granted	—	—
Outstanding — December 31, 2015	445,000	$	6.78
Granted	—	—
Outstanding — December 31, 2016	445,000	$	6.78
Exercisable — December 31, 2016	445,000	$	6.78

Schedule of Stock by Class

During the year ended December 31, 2016, we sold and issued shares of our common stock under this December 2015 ATM Agreement, as summarized in the following table:

	No. of Common Shares Issued	Proceeds Received (Net of Broker Commissions and Fees )
Common shares issued pursuant to the December 2015 ATM Agreement during the year ended December 31, 2016	10,890,915	$	73,869