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Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The weighted-averages for key assumptions used in determining the fair value of stock options granted were as follows:

	Three Months Ended March 31,
	2019		2018
Volatility	59.2%		56.0%
Risk-free interest rate	2.62%		2.40%
Expected life in years	6.17		6.23
Dividend yield rate	—%		—%

Share-based Compensation, Stock Options, Activity

A summary of the status of the Company’s nonvested options as of and changes during the three months ended March 31, 2019, are presented below:

			Weighted-Average
	Stock		Grant Date
	Options		Fair Value
Outstanding, December 31, 2018	3,257,801		$	7.32
Granted	822,975		10.38
Vested	(458,567)		6.96
Cancelled/forfeited	(192,978)		8.10
Outstanding, March 31, 2019	3,429,231		$	8.06

A summary of stock option activity under the Plan for the three months ended March 31, 2019, is presented below:

							Weighted
			Weighted				Average		Aggregate
			Average				Remaining		Intrinsic
	Stock		Exercise				Contractual		Value
	Options		Per Share				Terms (Years)		(in thousands)
Outstanding, December 31, 2018	3,257,801		$	11.99			9.26		$	7,119
Granted	822,975		18.09
Exercised	(20,544)		9.98
Cancelled/forfeited	(192,978)		12.15
Outstanding, March 31, 2019	3,867,254		$	13.29			8.78		$	37,345
Exercisable, March 31, 2019	438,023		$	10.15			4.85		$	5,440

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of RSUs activity under the Plan for the three months ended March 31, 2019, is presented below:

			Weighted
	Restricted		Average
	Stock		Grant Date
	Units		Fair Value
Outstanding, December 31, 2018	271,404		$	16.53
Granted	3,000		18.33
Forfeited	(17,534)		13.08
Outstanding, March 31, 2019	256,870		$	16.79

Schedule of stock-based compensation expense allocation

The following table summarizes stock-based compensation expense (in thousands) arising from the above Plan:

	Three Months Ended March 31,
	2019				2018
General and administrative	$	1,744			$	677
Research and development	254				329
	$	1,998			$	1,006

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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