The Company and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Summary of Outstanding Warrants

As of September 30, 2020, the Company had the following warrants outstanding (share amounts in thousands):  

Warrant type	Number of Shares		Exercise Price		Expiration
Common stock		33	$	47.00	January 2023
Common stock		1,846	$	2.40	October 2023

Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The following table sets forth securities outstanding that were excluded from the computation of diluted net loss per share as their inclusion would be anti-dilutive (in thousands):  

	September 30,
	2020		2019
Options outstanding to purchase common stock		160		82
Unvested restricted common stock units		60		91
Convertible notes		271		245
Warrants		1,879		1,994
Total		2,370		2,412