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Share-Based Compensation (Restricted Stock) (Details) - Restricted stock awards - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Awards      
Forfeited (in shares) 0 0 0
Fair value (in dollars) $ 0 $ 9,000 $ 140,000
RSA grant activity [Rollforward], Number of Shares      
Non‑vested , Begining Balance (in shares) 348,093 994,613  
Granted (in shares)   44,567 1,605,008
Vested (in shares) (344,084) (691,087) (610,395)
Non‑vested , Ending Balance (in shares) 4,009 348,093 994,613
RSA grant activity [Rollforward], Weighted-Average Fair Value (per share)      
Non‑vested , Begininng Balance (per share) $ 0.09 $ 0.09  
Granted (per share)   0.21 $ 0.09
Vested (per share) 0.09 0.09 0.09
Non‑vested , Ending Balance (per share) $ 0.21 $ 0.09 $ 0.09
Minimum      
Restricted Stock Awards      
Vesting period 6 months    
Maximum      
Restricted Stock Awards      
Vesting period 24 months