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Balance Sheet Account Detail (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liabilities $ 28,072 $ 4,012
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingently issuable common stock 2,300 2,200
Derivative liabilities 28,072 4,012
Total financial liabilities 30,372 6,212
Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingently issuable common stock 0 0
Derivative liabilities 0 0
Total financial liabilities 0 0
Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingently issuable common stock 0 0
Derivative liabilities 0 0
Total financial liabilities 0 0
Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingently issuable common stock 2,300 2,200
Derivative liabilities 28,072 4,012
Total financial liabilities $ 30,372 $ 6,212