Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Preferred stock and convertible preferred stock

Preferred stock and convertible preferred stock consist of the following:

	June 30, 2017		December 31, 2016
Preferred stock, $0.001 par value; 5,000,000 shares authorized at June 30, 2017 and December 31, 2016; no shares issued and outstanding at June 30, 2017 and December 31, 2016	$	—	$	—
Series B convertible preferred stock, $0.001 par value, 147,000 shares designated at June 30, 2017 and December 31, 2016, and 500 shares issued and outstanding at June 30, 2017 and December 31, 2016	$	1	$	1
Series D convertible preferred stock, $0.001 par value, 21,300 shares designated at June 30, 2017 and December 31, 2016, 14,052.93 and 17,202.65 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	$	14	$	17
Series E convertible preferred stock, $0.001 par value, 7,000 and zero shares designated at June 30, 2017 and December 31, 2016, respectively, and 7,000 and zero shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	$	7	$	—