Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Option Activity under 2018 Plan, 2013 Plan and 2010 Plan

A summary of option activity under the 2018 Plan, 2013 Plan, and 2010 Plan for the year ended December 31, 2019 is as follows:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in millions)
Options outstanding at December 31, 2018		781,725		$	16.34		9.0
Granted		1,063,150		$	13.84
Exercised		(7,813	)	$	11.81			$	0.1
Cancelled/forfeited		(523,587	)	$	21.51
Options outstanding at December 31, 2019		1,313,475		$	12.28		8.7	$	0.4
Options exercisable at December 31, 2019		339,184		$	11.79		7.4	$	0.1

Summary of Restricted Stock Unit Activity under 2018 Plan

A summary of restricted stock unit activity under the 2018 Plan for the year ended December 31, 2019 is as follows:

	Number of Shares			Weighted Average Grant Date Fair Value Per Share		Aggregate Intrinsic Value (in millions)
Non-vested outstanding at December 31, 2018		—			—
Granted		15,000		$	23.60
Cancelled/forfeited		(6,000	)
Non-vested outstanding at December 31, 2019		9,000		$	23.60	$	0.1