Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Summary of Common Stock Shares Activity

The following table summarizes common stock share activity for the six months ended June 30, 2016:

	Shares of Common Stock	Common Stock		Additional Paid-in Capital		Accumulated Deficit			Total Stockholders' Equity
Balance, December 31, 2015	13,905,599	$	14	$	192,069	$	(150,134	)	$	41,949
Net loss	—	—		—		(15,312		)	(15,312		)
Stock-based compensation expense	—	—		616		—			616
Common stock issued through employee stock purchase plan	1,229	—		5		—			5
Common stock issued through Sales Agreement	142,913	—		558		—			558
Common stock issued for cash under public offering, net of expenses	9,375,000	9		16,050		—			16,059
Balance, June 30, 2016	23,424,741	$	23	$	209,298	$	(165,446	)	$	43,875

Common Stock Reserved For Future Issuances

The Company had reserved shares of common stock for future issuance as follows:

	June 30, 2016	December 31, 2015
Outstanding stock options	1,804,473	1,379,727
Outstanding Series C-1 Preferred warrants	14,033	14,033
Outstanding 2016 Public Offering warrants	4,218,750	—
For possible future issuance under 2014 Equity Incentive Plan (Note 9)	683,892	552,415
For possible future issuance under Employee Stock Purchase Plan (Note 9)	78,465	50,283
For possible future issuance under 2015 Inducement Plan (Note 9)	165,000	165,000
Total common shares reserved for future issuance	6,964,613	2,161,458