Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Preferred stock and convertible preferred stock

Preferred stock and convertible preferred stock consist of the following:

	December 31,
	2019		2018
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2019 and 2018; no shares issued and outstanding at December 31, 2019 and 2018	$	—	$	—
Series B convertible preferred stock, $0.001 par value, 147,000 shares designated at December 31, 2019 and 2018, and 200 shares issued and outstanding at December 31, 2019 and 2018, respectively	1		1
Series D convertible preferred stock, $0.001 par value, 21,300 shares designated at December 31, 2019 and 2018, and zero and 14,052.93 shares issued and outstanding at December 31, 2019 and 2018, respectively	—		14
Series E convertible preferred stock, $0.001 par value, 7,000 designated at December 31, 2019 and 2018, and zero and 3,260.70 shares issued and outstanding at December 31, 2019 and 2018, respectively	—		3
Series F convertible preferred stock, $0.001 par value, 10,621 shares designated at December 31, 2019 and 2018, and no shares issued and outstanding at December 31, 2019 and 2018, respectively	—		—

Reserved Authorized Shares of Common Stock for Future Issuance

At December 31, 2019, the Company has reserved authorized shares of common stock for future issuance as follows:

Warrants	41,627
Outstanding stock options	164,980
Possible future issuance under inducement plan	1,250
Possible future issuance under stock option plans	250,410
Possible future issuance under employee stock purchase plan	10,946
Total	469,213