Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Stock Option Activity (Details)

v3.19.1
Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares outstanding beginning balance 1,594,615  
Shares granted 1,320,000  
Shares exercised  
Shares forfeited or expired (25,302)  
Shares outstanding ending balance 2,889,313 1,594,615
Shares exercisable ending balance 1,548,479  
Shares vested and expected to vest 2,825,153  
Weighted average grant price outstanding beginning balance $ 3.87  
Weighted average grant price granted 1.04 $ 1.49
Weighted average grant price exercised  
Weighted average grant price forfeited or expired 54.40  
Weighted average grant price outstanding ending balance 2.14 $ 3.87
Weighted average grant price exercisable ending balance 3.08  
Weighted average grant price vested and expected to vest $ 1.99  
Weighted average remaining contractual period outstanding beginning balance 9 years 1 month 9 days  
Weighted average remaining contractual period granted 9 years 6 months 3 days  
Weighted average remaining contractual period exercised 0 years  
Weighted average remaining contractual period forfeited or expired 0 years  
Weighted average remaining contractual period outstanding ending balance 8 years 9 months 29 days  
Weighted average remaining contractual period exercisable ending balance 8 years 2 months 30 days  
Weighted average remaining contractual period vested and expected to vest 9 years 11 days  
Aggregate instrinsic value outstanding beginning balance $ 1  
Aggregate instrinsic value granted  
Aggregate instrinsic value exercised  
Aggregate instrinsic value forfeited or expired  
Aggregate instrinsic value outstanding ending balance $ 1
Aggregate instrinsic value exercisable ending balance  
Aggregate instrinsic value vested and expected to vest