Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares outstanding beginning balance 190,551  
Shares granted 1,422,658  
Shares exercised  
Shares forfeited or expired (18,594)  
Shares outstanding ending balance 1,594,615 190,551
Shares exercisable ending balance 697,922  
Shares vested and expected to vest 1,541,848  
Weighted average grant price outstanding beginning balance $ 25.80  
Weighted average grant price granted 1.69 $ 1.40
Weighted average grant price exercised  
Weighted average grant price forfeited or expired 62.46  
Weighted average grant price outstanding ending balance 3.87 $ 25.80
Weighted average grant price exercisable ending balance 6.83  
Weighted average grant price vested and expected to vest $ 3.95  
Weighted average remaining contractual period outstanding beginning balance 5 years 5 months 1 day  
Weighted average remaining contractual period granted 9 years 7 months 6 days  
Weighted average remaining contractual period outstanding ending balance 9 years 1 month 9 days  
Weighted average remaining contractual period exercisable ending balance 8 years 4 months 17 days  
Weighted average remaining contractual period vested and expected to vest 9 years 1 month 2 days  
Aggregate instrinsic value outstanding beginning balance $ 632  
Aggregate instrinsic value granted 1  
Aggregate instrinsic value exercised  
Aggregate instrinsic value forfeited or expired  
Aggregate instrinsic value outstanding ending balance 1 $ 632
Aggregate instrinsic value exercisable ending balance  
Aggregate instrinsic value vested and expected to vest $ 1