Summary of Significant Accounting Policies - Net Loss per Share (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Anti-dilutive securities
Total shares excluded from diluted net loss per share applicable to common stockholders	9,466,782	8,647,368
Convertible Preferred Stock
Anti-dilutive securities
Total shares excluded from diluted net loss per share applicable to common stockholders		666,000
Stock options
Anti-dilutive securities
Total shares excluded from diluted net loss per share applicable to common stockholders	5,608,057	4,741,000
Unvested Restricted Stock Unit
Anti-dilutive securities
Total shares excluded from diluted net loss per share applicable to common stockholders	1,713,083	1,122,024
Warrants
Anti-dilutive securities
Total shares excluded from diluted net loss per share applicable to common stockholders	2,145,642	2,118,344