Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Measurements Levels (Details)

v3.19.1
Fair Value Measurements Measurements Levels (Details) - Fair value, measurements, recurring - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 2,798  
ESW Holdings, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 2,015  
Hale Capital, LLP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 750 $ 819
iStudy Co., Ltd.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 33  
Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Quoted Prices in Active Markets (Level 1) | ESW Holdings, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Quoted Prices in Active Markets (Level 1) | Hale Capital, LLP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0 0
Quoted Prices in Active Markets (Level 1) | iStudy Co., Ltd.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Significant Other Observable Inputs (Level 2) | ESW Holdings, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Significant Other Observable Inputs (Level 2) | Hale Capital, LLP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0 0
Significant Other Observable Inputs (Level 2) | iStudy Co., Ltd.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0  
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 2,798  
Significant Unobservable Inputs (Level 3) | ESW Holdings, Inc.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 2,015  
Significant Unobservable Inputs (Level 3) | Hale Capital, LLP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 750 $ 819
Significant Unobservable Inputs (Level 3) | iStudy Co., Ltd.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 33