Description of Business and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Potentially Dilutive Common Stock Equivalent Securities

The computation of basic and diluted net loss per share for the six months ended June 30, 2019 and 2018 excludes the common stock equivalents of the following potentially dilutive securities because their inclusion, as the Company is in a net loss position, would be anti-dilutive:

	Six months ended June 30,
	2019		2018
Vesting of restricted stock units		1,166,006		1,219,419
Conversion of convertible notes into common stock		3,629,627		14,154,500
Conversion of convertible related party notes    into common stock		21,909,541		21,909,541
Exercise of common stock warrants		31,856		31,856
Employee stock purchase plan		367,792		248,067
Exercise of common stock options		15,512,639		11,368,356
Exercise of warrants associated with public offering		26,666,667		—
Exercise of warrants associated with direct placement		—		14,000,000
		69,284,128		62,931,739