Warrants (Tables)

12 Months Ended

Dec. 31, 2016

Roll-forward of Preferred Stock Warrants

The following represents the common stock issued or assumed during the years ended December 31, 2015. All warrants are exercisable for Common Stock.

									Number of Shares Underlying Warrants
									For the Year Ended December 31,
Warrants	Issue Date		Classification		Exercise Price		Expiration Date		2016		2015
Private Placement Warrants		June 15, 2015		Equity	$	7.56		June 15, 2020		3,190,030		3,190,030
Hercules Warrants		June 15, 2015		Equity	$	8.35		June 16, 2020		25,150		25,150
MTS Warrants		August 31, 2015		Equity	$	11.80		August 31, 2020		30,000		30,000
Warrants Assumed in Merger
Series A Warrants		March-May 2014		Equity	$	17.83		March-May 2016		—		1,219,000
Representative’s Warrants		March 21, 2014		Equity	$	22.66		March 21, 2019		37,100		37,100
Underwriter’s Warrants		March 21, 2014		Equity	$	22.66		March 21, 2019		2,160		2,160

At December 31, 2016, the intrinsic value of the common stock warrants outstanding was $0.

Preferred Stock Warrants [Member]

Roll-forward of Preferred Stock Warrants

A roll-forward of the Preferred Stock Warrants is as follows:

	Preferred Stock Warrants			Estimated Fair Value
Balance — January 1,2015		14,544,247		$	1,309
Decrease in estimated fair value of warrants		—			(1,309	)
Cancellation and gain (loss) on extinguishment		(14,544,247	)		—
Balance — December 31, 2015		—		$	—