Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Grants Outstanding

The following table summarizes the stock grants outstanding under our 2005 Long-Term Incentive Plan ("2005 LTIP"), the 2010 ECP and the 2017 ECP for the six months ended June 30, 2020:

	Options Outstanding	RSUs Outstanding	Options and RSUs Exercised	Available Shares	Total
2017 ECP	—	1,752,582	728,346	6,769,072	9,250,000
2010 ECP (**)	14,498	1,072,171	3,969,590	—	5,056,259
2005 LTIP (*)	—	—	953,835	—	953,835
Total	14,498	2,824,753	5,651,771	6,769,072	15,260,094

(*) Expired June 2015

(**) Expired April 2020

Schedule of Stock Option Award Activity

The following table summarizes the activities of stock option awards under the 2005 LTIP and the 2010 ECP for the six months ended June 30, 2020:

	Shares Subject to Options Outstanding
	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Balance as of December 31, 2019	18,248	$	1.74	1.8	$	2,019
Stock options canceled	3,750	$	3.7	—	—
Balance as of June 30, 2020	14,498	$	1.23	1.39	$	2,019
Stock options exercisable as of June 30, 2020	14,498	$	1.23	1.39	$	2,019

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes the activities for our unvested RSUs for the six months ended June 30, 2020:

	Unvested RSUs
	Number of Shares	Weighted Average Grant Date Fair Value
Unvested as of December 31, 2019	2,568,951	$	0.79
Granted	587,103	$	0.44
Vested	331,301	$	0.21
Forfeited	—	$	—
Unvested as of June 30, 2020	2,824,753	$	0.31