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Stock Compensation and Unit-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Stock Options Granted Activity

The following table presents a summary of stock options granted:

	Number of Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Outstanding, December 31, 2018		2,228,904			$	14.89				9.5			*
Granted		2,146,699				4.68
Exercised		—				—
Cancelled		(1,244,337	)			13.34
Outstanding, December 31, 2019		3,131,266			$	8.53				8.9			*
Exercisable, December 31, 2019		1,348,994			$	11.99				8.6			*
* de minimis

Summary of Additional Information about Stock Options

The following table provides additional information about stock options that are outstanding and exercisable at December 31, 2019:

Exercise Price		Options Outstanding				Weighted Average Remaining Contractual Life (Years)				Options Exercisable
$1.40 - $2.50			1,019,495				9.7				95,635
$2.51 - $7.52			647,629				9.2				324,900
$7.53 - $15.00			1,464,142				8.6				928,459

Summary of Restricted Stock Awards Granted Activity

The following table presents a summary of restricted stock awards granted:

		Number of Shares				Weighted Average Grant Date Fair Value
Nonvested, December 31, 2018			185,571			$	15.00
Granted			204,088				6.88
Vested			(139,473	)			14.25
Cancelled			(122,681	)			9.27
Nonvested, December 31, 2019			127,505			$	8.09

Summary of Restricted Stock and Deferred Stock Units Granted Activity

The following table presents a summary of restricted and deferred stock units (“Stock Units”) granted:

		Number of Shares				Weighted Average Grant Date Fair Value
Nonvested, December 31, 2018			79,998			$	15.00
Granted			1,566,205				2.47
Vested			(274,939	)			4.62
Cancelled			(129,771	)			1.90
Nonvested, December 31, 2019			1,241,493			$	2.86

Summary of Weighted Average Assumptions Used in Valuing Plans

The weighted average assumptions used in the Black-Scholes option pricing model in valuing stock options granted in the periods presented were:

		2019				2018
Fair value at grant date		$	3.39			$	2.50
Expected volatility		95.9%				70.9%
Risk-free interest rate		2.1%				2.7%
Expected holding period, in years			5.9				5.9
Dividend yield			—				—

2019 Employee Stock Purchase Plan

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Weighted Average Assumptions Used in Valuing Plans

The weighted average assumptions used in the Black-Scholes valuation of the fair value of the discount for the year ended December 31, 2019 were:

		2019
Fair value at grant date		$	0.75
Expected volatility		169%
Risk-free interest rate		2.3%
Expected holding period		6 months
Dividend yield			—

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