Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Potentially dilutive securities
Potentially dilutive securities	464,819	1,673,488	1,915,337
Stock options to purchase common stock
Potentially dilutive securities
Potentially dilutive securities	417,109	1,625,778	1,867,627
Warrants for the purchase of common stock
Potentially dilutive securities
Potentially dilutive securities	47,710	47,710	47,710