Balance Sheet Account Detail (Fair Value Measurements) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 0	$ 940
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingently issuable common stock	300	500
Derivative liabilities	0	940
Total financial liabilities	300	1,440
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	300	500
Derivative liabilities	0	940
Total financial liabilities	$ 300	$ 1,440