Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details)

v3.19.1
Fair Value Measurements - Schedule of Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 500 $ 504
Fair Value, Measurements, Recurring [Member] | Common Stock Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 1,588 1,566
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Common Stock Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 1,588 $ 1,566