Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Federal Home Loan Banks [Abstract]

Key Assumptions Used in Determining Fair Value of Options Granted

The key assumptions used in determining the fair value of options granted during the three months ended March 31, 2019 follows:

Expected price volatility	61.83%-62.04%
Risk-free interest rate	2.41%-2.66%
Weighted average expected life in years	6 years
Dividend yield	—

Summary of Stock Option Activity

Option activity during the three months ended March 31, 2019 was as follows:

	Number of shares			Weighted average exercise price per share		Aggregate intrinsic value
Outstanding at January 1, 2019		4,406,004		$	3.19	$	4,172
Granted in 2019:
Officers and Directors		1,113,516			3.88
Employees		917,517			4.51
Exercised		(150,275	)		3.14
Forfeitures		(10,423	)		2.18
Outstanding at March 31, 2019		6,276,399		$	3.50	$	12,209

Summary of Restricted Stock Activity

Restricted stock activity during the three months ended March 31, 2019 was as follows:

	Number of restricted shares			Weighted average fair market value per RSU
Outstanding at January 1, 2019		2,166,102		$	2.59
Granted:
Executive officers		223,250			4.44
Employees		47,000			4.67
Vested		(500,366	)		4.90
Outstanding at March 31, 2019		1,935,986		$	2.98