Stockholders' Equity (Details) - Common stock reserved for issuance - shares	Mar. 31, 2018	Dec. 31, 2017
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance	1,224,282	1,977,924
Convertible Preferred Stock Outstanding [Member]
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance		1,221,064
Options Issued and Outstanding [Member]
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance	832,942	304,850
Options Available for Future Grants [Member]
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance	380,426
Cumulative Convertible Preferred Stock Dividends [Member]
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance		441,096
Convertible Preferred Stock Warrants [Member]
Stockholders' Equity (Details) - Common stock reserved for issuance [Line Items]
Common stock reserved for issuance	10,914	10,914