Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

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 three months ended September 30, 2019:

	Options Outstanding	RSUs Outstanding	Options and RSUs Exercised	Available Shares	Total
2017 ECP	—	433,615	511,544	1,354,841	2,300,000
2010 ECP	14,498	229,004	3,855,091	983,425	5,082,018
2005 LTIP (*)	3,750	—	960,083	—	963,833
Total	18,248	662,619	5,326,718	2,338,266	8,345,851

(*) Expired June 2015

Schedule of Stock Option Award Activity

The following table summarizes the activities of stock option awards under the 2005 LTIP and the 2010 ECP as of September 30, 2019:

	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, 2018	264,246	$	2.84	2.7	$	2,019
Stock options canceled	245,998	$	2.92	—	—
Balance as of September 30, 2019	18,248	$	1.74	1.8	$	2,019
Stock options exercisable as of September 30, 2019	18,248	$	1.74	1.8	$	2,019

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes the activities for our unvested RSUs for the three months ended September 30, 2019:

	Unvested RSUs
	Number of Shares	Weighted Average Grant Date Fair Value
Unvested as of December 31, 2018	1,571,864	$	0.79
Granted	1,155,097	$	0.33
Vested	944,052	$	0.58
Forfeited	1,120,290	$	0.83
Unvested as of September 30, 2019	662,619	$	0.21