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Stockholders' Equity/(Deficit) (Tables)

12 Months Ended

Dec. 31, 2018

Federal Home Loan Banks [Abstract]

Summary of Preferred Stock Allocated to Investors

 The Purchase Agreement provides for the Company to issue and sell to the Investor shares of the Company’s preferred stock in the amounts set forth in the following table (numbers have been adjusted for the February 2016 reverse stock split):

Convertible Preferred Stock		Shares				Price Per Share				Total Investment
Series AA-1			8,427,004			$	12.00			$	101,124,048
Series AA-2			7,223,145			$	6.00				43,338,870
			15,650,149							$	144,462,918

Stock Options Valuation Assumptions

 The assumptions used in the Black-Scholes model were as follows for stock options granted in the years ended December 31, 2018, 2017 and 2016:

		2018				2017				2016
Risk-free interest rate			—				—			1.29 - 2.25%
Expected volatility of common stock			—				—			80.87 - 82.69%
Dividend yield			—				—			0%
Expected life of options			—				—			8.2 years

Summary of Stock Option Activity

Additional information with respect to both plans stock option activity is as follows:

		Number of Shares				Weighted Average Exercise Price
Outstanding at December 31, 2015			375,283			$	32.04
Granted			22,493			$	2.74
Exercised			—			$	—
Cancelled			(65,361	)		$	32.82
Outstanding at December 31, 2016			332,415			$	21.55
Granted			—			$	—
Exercised			—			$	—
Cancelled			(84,598	)		$	35.59
Outstanding at December 31, 2017			247,817			$	16.76
Granted			—			$	—
Exercised			—			$	—
Cancelled			(9,166	)		$	36.52
Outstanding at December 31, 2018			238,651			$	15.95
Options exercisable at December 31, 2016			300,751			$	22.30
Options exercisable at December 31, 2017			247,817			$	16.76
Options exercisable at December 31, 2018			238,651			$	15.95

Stock Options Outstanding

The following table summarizes information about stock options outstanding at December 31, 2018:

Stock Options Outstanding
Range of Exercise Prices				Number of Shares Outstanding				Weighted Average Remaining Contractual Life in Years				Weighted Average Exercise Price
	$26.40 - $26.40				75,158				5.00			$	26.40
	$12.48 - $12.84				141,000				6.00			$	12.48
	$2.02 - $3.59				22,493				7.65			$	2.74
					238,651				5.84			$	15.95

Estimated Fair Value of Restricted Stock Award

 A summary of the status of the restricted stock awards as of December 31, 2018 and changes during the year ended December 31, 2018 is presented as follows:

		Number of Shares				Weighted Average Grant Date Fair Value
Unvested at December 31, 2017			132,826			$	5.90
Granted			—			$	—
Vested			(91,159	)		$	3.55
Cancelled			—			$	—
Unvested at December 31, 2018			41,667			$	11.04

Summary of Common Stock Warrants Outstanding

The following table summarizes our common stock warrants outstanding at December 31, 2018:

Common Stock Warrants		Exercise Price				Termination Date
120,000		$	3.52				10/01/2021
65,625		$	12.00				07/12/2021
700,000			7.16				11/02/2023
885,625

Summary of Analysis of Activity in CARs Balances

The following is an analysis of activity in the CARs balances as of December 31, 2018:

		Number of CARs
		Key Employee Plan				Nonemployee Director Plan
Unvested at December 31, 2017			229,076				—
Granted			406,384				278,000
Vested			(249,880	)			(278,000	)
Cancelled			—				—
Unvested at December 31, 2018			385,580				—

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