Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Inputs (Details)

v3.8.0.1
Fair Value Measurements - Inputs (Details) - $ / shares
9 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 28, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]              
Stock price (in dollars per share) $ 1.79 $ 1.51 $ 1.51 $ 0.94 $ 0.68 $ 1.05 $ 0.99
CCE interest rate 1.00%            
Convertible note embedded derivative liability              
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]              
Stock price volatility 70.00%            
Probability of change in control 1.75%            
Stock price (in dollars per share) $ 1.79            
Expected term 2 years 9 months            
Risk-free interest rate 1.94%            
Assumed early conversion/exercise price (in dollars per share) $ 2.73