Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Plan Includes Stock Options and Restricted Stock Units

The following is a summary of, the 2005 Plan and the 2015 Plan, which includes stock options and restricted stock units:


	Unit (in Thousands)
Available for grant at January 1, 2014		3,566
Restricted stock units granted		(1,923	)
Option and restricted stock units forfeited		44

Available for grant at December 31, 2014		1,687
Authorized		20,000
Restricted stock units granted		(2,000	)
Option and restricted stock units forfeited		175

Available for grant at December 31, 2015		19,862
Restricted stock units granted		(1,446	)
Option and restricted stock units forfeited		335

Available for grant at December 31, 2016		18,751

Summary of Stock Option Activity

A summary of the stock option activity and related information is as follows:


	Number of Options Shares (in Thousands)			Weighted Average Exercise Price (US$)		Weighted Average Remaining Contractual Life (Years)
Outstanding at January 1, 2014		1,410			1.47
Options forfeited		—			—
Options exercised		(352	)		1.46

Outstanding at December 31, 2014		1,058			1.47		1.35

Options vested and expected to vest after December 31, 2014		1,058			1.47		1.35
Options forfeited		(143	)		1.47
Options exercised		(336	)		1.47

Outstanding at December 31, 2015		579			1.47		0.92

Options vested and expected to vest after December 31, 2015		579			1.47		0.92
Options forfeited		(257	)		1.47		—
Options exercised		(64	)		1.47		—

Outstanding at December 31, 2016		258			1.47		0.25

Options vested and expected to vest after December 31, 2016		258			1.47		0.25

Options exercisable at December 31, 2016		258			1.47		0.25

Summary of Restricted Stock Units and Changes

A summary of the status of restricted stock units and changes is as follows:


	Number of Non-vested Stock Units (in Thousands)			Weighted Average Grant Date Fair Value (US$)		Weight Average Remaining Recognition Period (Years)
Non-vested at January 1, 2014		3,921			2.90		0.43
Restricted stock units granted		1,923			5.13
Restricted stock units vested		(3,640	)		2.96
Restricted stock units forfeited		(44	)		4.92

Non-vested at December 31, 2014		2,160			4.90		0.31
Restricted stock units granted		2,000			6.83
Restricted stock units vested		(2,003	)		4.96
Restricted stock units forfeited		(32	)		5.85

Non-vested at December 31, 2015		2,125			6.65		0.73
Restricted stock units granted		1,446			12.67
Restricted stock units vested		(1,726	)		6.46
Restricted stock units forfeited		(78	)		6.57

Non-vested at December 31, 2016		1,767			11.65		0.47

Stock-based Compensation Expense

The following table shows total stock-based compensation expense included in the Consolidated Statements of Income for the years ended December 31, 2014, 2015 and 2016.


	Year Ended December 31
	2014		2015		2016
	US$		US$		US$
Cost of sales		282		261		400
Research and development		6,773		6,565		10,529
Sales and marketing		1,746		1,790		3,122
General and administrative		1,546		1,802		3,313

		10,347		10,418		17,364