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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

A summary of activity for the year ended December 31, 2018 is as follows:

		Options				Weighted Average Exercise Price
Balance as of January 1, 2018			100,870			$	119.25
Granted			117,300			$	2.16
Expired			(1,033	)		$	771.07
Cancelled/forfeited			(79,590	)		$	5.93
Balance as of December 31, 2018			137,547			$	80.07

Stock Options Vested and Expected to Vest

		Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (years)				Aggregate Intrinsic Value
Balance as of December 31, 2018			137,547			$	80.07				7.90			$	—
Vested and expected to vest at December 31, 2018			122,637			$	88.94				7.78			$	—
Exercisable at December 31, 2018			64,836			$	161.99				6.59			$	—

Weighted-average Assumptions

The fair value of each option awarded during the year ended December 31, 2018 and 2017 was estimated on the date of grant using the Black-Scholes-Merton option valuation model based on the following weighted-average assumptions:

		Years ended December 31,
		2018				2017
Expected term		7.1 years				6.6 years
Risk-free interest rate			2.94	%			2.20	%
Volatility			92.87	%			78.84	%
Dividends			—				—
Resulting weighted average grant date fair value		$	1.74			$	1.05

Compensation Cost Recognized for Stock Options and Restricted Stock Awards

The following summarizes the total compensation cost recognized for the stock options and restricted stock awards in the accompanying financial statements (in thousands):

		Years ended December 31,
		2018				2017
Total compensation cost for share-based payment    arrangements recognized in the statement of operations    (net of tax of $0)		$	355			$	753

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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-Name Accounting Standards Codification
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Tabular disclosure for share-based compensation 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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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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