Loan Payable to Silicon Valley Bank - Schedule of Future Cash Payments of Loan Payable (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2019	$ 843
2020	386
Total payments of principal and interest	1,229
Less: amounts representing interest	(46)
Total payments of principal before deferred financing costs	1,183
Less: deferred financing costs	(36)
Total loan payable, net of deferred financing costs	$ 1,147