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Stockholders' Equity and Redeemable Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Schedule of warrant activity

A summary of warrant activity for the nine months ended September 30, 2018 is presented below:

															Weighted Average
																Remaining Contractual
								Weighted Average								Life
				Warrants				Exercise Price				Total Intrinsic Value				(in years)
Outstanding as of December 31, 2017				1,249,754			$	8.98			$	—				2.92
Outstanding as of September 30, 2018				1,249,754			$	8.98								2.17
Exercisable as of September 30, 2018				1,249,754			$	8.98			$	—				2.17

Schedule of option activity

A summary of option activity under the Company’s employee stock option plan for the nine months ended September 30, 2018 is presented below:

														Weighted Average
						Weighted Average								Remaining Contractual
		Number of Shares				Exercise Price				Total Intrinsic Value				Life (in years)
Outstanding as of December 31, 2017			325,597			$	78.20			$	5,999				3.2
Employee options granted			200,000				1.39				—				9.4
Outstanding as of September 30, 2018			525,597			$	48.97			$	—				5.1
Options vested and expected to vest			525,597			$	48.97			$	—				5.1
Options vested and exercisable			500,597			$	51.36			$	—				4.9

A summary of option activity under the Company’s non-employee stock option plan for the nine months ended September 30, 2018 is presented below:

														Weighted Average
						Weighted Average								Remaining Contractual
		Number of Shares				Exercise Price				Total Intrinsic Value				Life (in years)
Outstanding as of December 31, 2017			2,893			$	98.07			$	—				3.4
Outstanding as of September 30, 2018			2,893			$	98.07			$	—				2.7
Options vested and expected to vest			2,893			$	98.07			$	—				2.7
Options vested and exercisable			2,893			$	98.07			$	—				2.7

Schedule of stock-based compensation

Stock-based compensation for the nine months ended September 30, 2018 and 2017 was comprised of the following ($ in thousands):

		For the Three Months Ended September 30,								For the Nine Months Ended September 30,
		2018				2017				2018				2017
Employee restricted stock awards		$	—			$	—			$	106			$	—
Employee stock option awards			28				2				208				13
Total compensation expense		$	28			$	2			$	314			$	13

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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