Stockholders' Equity - Common Stock Reserved for Future Issuance (Details)	Dec. 31, 2019 shares
Class of Stock [Line Items]
Total common shares reserved for future issuance	469,213
Inducement Plan
Class of Stock [Line Items]
Total common shares reserved for future issuance	1,250
Stock Option Plans
Class of Stock [Line Items]
Total common shares reserved for future issuance	250,410
Employee Stock Purchase Plan
Class of Stock [Line Items]
Total common shares reserved for future issuance	10,946
Options
Class of Stock [Line Items]
Total common shares reserved for future issuance	164,980
Warrants
Class of Stock [Line Items]
Total common shares reserved for future issuance	41,627