Equity Incentive Awards (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Options Activity

The following table summarizes the Company’s option activity and related information:

	Number of Options (in thousands)			Weighted- Average Exercise Price
Balance at December 31, 2018		6,447		$	5.83
Options granted		4,265			7.13
Options exercised		(1,133	)		2.31
Options cancelled		(924	)		3.77
Balance at September 30, 2019		8,655		$	7.15
Exercisable as of September 30, 2019		3,563		$	7.59

Summary of Restricted Stock Units Activity

The following table summarizes the Company’s RSUs activity and related information:

	Number of Units (in thousands)			Weighted- Average Grant- Date Fair Value
Outstanding at December 31, 2018		2,397		$	9.23
Granted		250			3.95
Vested and released		(676	)		4.88
Forfeited		(834	)		4.75
Outstanding at September 30, 2019		1,137		$	4.66

Stock-Based Compensation Expense

The following table presents, by operating expense, the Company’s stock-based compensation expense:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
	(In thousands)
Research and development	$	1,352	$	1,693	$	2,829	$	4,892
General and administrative		1,309		1,303		4,220		7,358
Total stock-based compensation expense	$	2,661	$	2,996	$	7,049	$	12,250